How to allow my mail gateway as inbound?

[gvansanden]

I have a proxmox mail gateway, but stallwart does not accept mail from it as it is not an authorized MX server for external domains.
How to handle that?

[mdecimus]

You need to configure a relay host, search for "relay" in the documentation to learn more.

[gvansanden]

I did, it works for outbound, but I am talking  about inbound.  The gateway is never the MX for other domains so Stalwart rejects it 07 Jan 2024 08:18:59 Mauro D. ***@***.***>:

…

You need to configure a relay host, search for "relay" in the documentation to learn more. — Reply to this email directly, view it on GitHub[#19 (comment)], or unsubscribe[https://github.com/notifications/unsubscribe-auth/AANORFNC3FYGKT5Y4DGTVMTYNJD5VAVCNFSM6AAAAABBOQQSSGVHI2DSMVQWIX3LMV43SRDJONRXK43TNFXW4Q3PNVWWK3TUHM4DAMZVGIYDO]. You are receiving this because you authored the thread. [Tracking image][https://github.com/notifications/beacon/AANORFJF34A2W4U62NFMVR3YNJD5VA5CNFSM6AAAAABBOQQSSGWGG33NNVSW45C7OR4XAZNRIRUXGY3VONZWS33OINXW23LFNZ2KUY3PNVWWK3TUL5UWJTQAPKNYO.gif]

[mdecimus]

If Stalwart SMTP is behind a proxy then wait until tomorrow when version 0.5.2 is released with support for the proxy protocol.
In the meantime you can disable SPF and DMARC if that is the reason why incoming connections are rejected.

[gvansanden]

Ok, thank you! How do I disable them? It is behind a mail gateway using the normal SMTP protocol, so that also won't help 07 Jan 2024 08:32:07 Mauro D. ***@***.***>:

…

If Stalwart SMTP is behind a proxy then wait until tomorrow when version 0.5.2 is released with support for the proxy protocol. In the meantime you can disable SPF and DMARC if that is the reason why incoming connections are rejected. — Reply to this email directly, view it on GitHub[#19 (reply in thread)], or unsubscribe[https://github.com/notifications/unsubscribe-auth/AANORFIFS3RJXEIZ5IWQCM3YNJFO7AVCNFSM6AAAAABBOQQSSGVHI2DSMVQWIX3LMV43SRDJONRXK43TNFXW4Q3PNVWWK3TUHM4DAMZVGI2DQ]. You are receiving this because you authored the thread. [Tracking image][https://github.com/notifications/beacon/AANORFLZ4O2RHV4LJ6ETDKTYNJFO7A5CNFSM6AAAAABBOQQSSGWGG33NNVSW45C7OR4XAZNRIRUXGY3VONZWS33OINXW23LFNZ2KUY3PNVWWK3TUL5UWJTQAPKN3A.gif]

[mdecimus]

Here is a link to the docs covering email auth: https://stalw.art/docs/category/email-authentication

[gvansanden]

I tried it but mail stll seems to bounce:
2024-01-08T08:40:36.752574Z INFO delivery{id=758018436 return_path="guy.van.sanden@protonmail.com" nrcpt=1 size=5838}:attempt{domain="taurix.be" attempt_number=0}: smtp::outbound::delivery: context="dns" event="ip-lookup-failed" mx="10.250.0.37" status=Permanent Failure: Connection to '10.250.0.37' failed: record not found for MX
2024-01-08T08:40:36.753999Z INFO delivery{id=758018436 return_path="guy.van.sanden@protonmail.com" nrcpt=1 size=5838}: smtp::queue::spool: Message queued for delivery. context="queue" event="scheduled" id=5052985732 from="<>" nrcpts=1 size=2769
2024-01-08T08:40:36.754080Z INFO delivery{id=758018436 return_path="guy.van.sanden@protonmail.com" nrcpt=1 size=5838}: smtp::outbound::delivery: Delivery completed. context="queue" event="completed"
2024-01-08T08:40:36.908476Z WARN delivery{id=5052985732 return_path="<>" nrcpt=1 size=2769}:attempt{domain="protonmail.com" attempt_number=0}: smtp::outbound::delivery: MX not authorized by policy. context="sts" event="policy-error" mx="10.250.0.37"
2024-01-08T08:40:36.908497Z INFO delivery{id=5052985732 return_path="<>" nrcpt=1 size=2769}: smtp::queue::dsn: Failed delivery of message with null return path. context="queue" event="double-bounce" id=5052985732 failures=["guy.van.sanden@protonmail.com (MTA-STS failed to authenticate 'protonmail.com': MX "10.250.0.37" not authorized by policy.)\r\n"]

[auth.iprev]
verify = [ { if = "listener", eq = "smtp", then = "relaxed" },
{ else = "disable" } ]

[auth.dkim]
verify = "relaxed"
sign = [ { if = "listener", ne = "smtp", then = ["rsa"] },
{ else = [] } ]

[auth.spf.verify]
#ehlo = [ { if = "listener", eq = "smtp", then = "relaxed" },

{ else = "disable" } ]

#mail-from = [ { if = "listener", eq = "smtp", then = "relaxed" },

{ else = "disable" } ]

ehlo = "disable"
mail-from = "disable"

[auth.arc]

verify = "relaxed"

verify = "disable"
seal = ["rsa"]

[auth.dmarc]
#verify = [ { if = "listener", eq = "smtp", then = "relaxed" },

{ else = "disable" } ]

verify = "disable"

[gvansanden]

Is there anything else I need to do? It's still not accepting mail...

[gvansanden]

My primary mail is in the default_domain as well BTW

[gvansanden]

I think DNS is not working and/or it can't reach the host network to connect to the relay:
2024-01-09T22:15:18.622187Z DEBUG delivery{id=758153718 return_path="guy.van.sanden@protonmail.com" nrcpt=1 size=4484}:attempt{domain="taurix.be" attempt_number=0}: smtp::outbound::delivery: Failed to retrieve TLSRPT record: DNS record not found: Non-Existent Domain context="tlsrpt"

[mdecimus]

It looks like you are using the IP address 10.250.0.37 as your relay host. Try changing it to the hostname instead as IP addresses are not supported in relay hosts.

[gvansanden]

This is a full trace of an inbound message after a clean restart, it does not get delivered
There is a bounce so the outbound relay does seem to work now:
BDAT 48228 LAST with code 554 (5.4.0) 'Error: too many hops')

2024-01-10T10:15:18.261749Z INFO utils: Starting Stalwart Mail Server v0.5.1...
2024-01-10T10:15:19.142420Z INFO utils::listener::listen: Starting listener id="imap" protocol=Imap bind.ip="::" bind.port=143 tls=false
2024-01-10T10:15:19.142453Z INFO utils::listener::listen: Starting listener id="imaptls" protocol=Imap bind.ip="::" bind.port=993 tls=true
2024-01-10T10:15:19.142459Z INFO utils::listener::listen: Starting listener id="jmap" protocol=Jmap bind.ip="::" bind.port=8080 tls=false
2024-01-10T10:15:19.142479Z INFO utils::listener::listen: Starting listener id="sieve" protocol=ManageSieve bind.ip="::" bind.port=4190 tls=true
2024-01-10T10:15:19.142487Z INFO utils::listener::listen: Starting listener id="smtp" protocol=Smtp bind.ip="::" bind.port=25 tls=false
2024-01-10T10:15:19.142491Z INFO utils::listener::listen: Starting listener id="submission" protocol=Smtp bind.ip="::" bind.port=587 tls=false
2024-01-10T10:15:19.142497Z INFO utils::listener::listen: Starting listener id="submissions" protocol=Smtp bind.ip="::" bind.port=465 tls=true
2024-01-10T10:15:50.618084Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38476}: utils::listener::listen: context="tls" event="handshake" version=TLSv1_3 cipher=TLS13_AES_256_GCM_SHA384
2024-01-10T10:15:50.723716Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38476}: smtp::queue::spool: Message queued for delivery. context="queue" event="scheduled" id=758196950 from="guy.vansanden@energiapharma.be" nrcpts=1 size=35460
2024-01-10T10:15:51.060589Z INFO delivery{id=758196950 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=35460}:attempt{domain="taurix.net" attempt_number=0}: smtp::outbound::session: context="rcpt" event="delivered" rcpt="guy@taurix.net" mx="proxmail01.internal.taurix.net" response=Delivered: Code: 250, Enhanced code: 2.1.5, Message: Ok
2024-01-10T10:15:51.060977Z INFO delivery{id=758196950 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=35460}: smtp::outbound::delivery: Delivery completed. context="queue" event="completed"
2024-01-10T10:15:51.556545Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38490}: utils::listener::listen: context="tls" event="handshake" version=TLSv1_3 cipher=TLS13_AES_256_GCM_SHA384
2024-01-10T10:15:51.558841Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38490}: smtp::queue::spool: Message queued for delivery. context="queue" event="scheduled" id=5053164247 from="guy.vansanden@energiapharma.be" nrcpts=1 size=36321
2024-01-10T10:15:51.614766Z INFO delivery{id=5053164247 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=36321}:attempt{domain="taurix.net" attempt_number=0}: smtp::outbound::session: context="rcpt" event="delivered" rcpt="guy@taurix.net" mx="proxmail01.internal.taurix.net" response=Delivered: Code: 250, Enhanced code: 2.1.5, Message: Ok
2024-01-10T10:15:51.615043Z INFO delivery{id=5053164247 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=36321}: smtp::outbound::delivery: Delivery completed. context="queue" event="completed"
2024-01-10T10:15:52.111484Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38498}: utils::listener::listen: context="tls" event="handshake" version=TLSv1_3 cipher=TLS13_AES_256_GCM_SHA384
2024-01-10T10:15:52.113789Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38498}: smtp::queue::spool: Message queued for delivery. context="queue" event="scheduled" id=9348131544 from="guy.vansanden@energiapharma.be" nrcpts=1 size=37161
2024-01-10T10:15:52.145094Z INFO delivery{id=9348131544 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=37161}:attempt{domain="taurix.net" attempt_number=0}: smtp::outbound::session: context="rcpt" event="delivered" rcpt="guy@taurix.net" mx="proxmail01.internal.taurix.net" response=Delivered: Code: 250, Enhanced code: 2.1.5, Message: Ok
2024-01-10T10:15:52.145432Z INFO delivery{id=9348131544 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=37161}: smtp::outbound::delivery: Delivery completed. context="queue" event="completed"
2024-01-10T10:15:52.644590Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38506}: utils::listener::listen: context="tls" event="handshake" version=TLSv1_3 cipher=TLS13_AES_256_GCM_SHA384
2024-01-10T10:15:52.646909Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38506}: smtp::queue::spool: Message queued for delivery. context="queue" event="scheduled" id=13643098840 from="guy.vansanden@energiapharma.be" nrcpts=1 size=38022
2024-01-10T10:15:52.702482Z INFO delivery{id=13643098840 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=38022}:attempt{domain="taurix.net" attempt_number=0}: smtp::outbound::session: context="rcpt" event="delivered" rcpt="guy@taurix.net" mx="proxmail01.internal.taurix.net" response=Delivered: Code: 250, Enhanced code: 2.1.5, Message: Ok
2024-01-10T10:15:52.702773Z INFO delivery{id=13643098840 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=38022}: smtp::outbound::delivery: Delivery completed. context="queue" event="completed"
2024-01-10T10:15:53.200422Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38520}: utils::listener::listen: context="tls" event="handshake" version=TLSv1_3 cipher=TLS13_AES_256_GCM_SHA384
2024-01-10T10:15:53.202732Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38520}: smtp::queue::spool: Message queued for delivery. context="queue" event="scheduled" id=17938066137 from="guy.vansanden@energiapharma.be" nrcpts=1 size=38862
2024-01-10T10:15:53.228858Z INFO delivery{id=17938066137 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=38862}:attempt{domain="taurix.net" attempt_number=0}: smtp::outbound::session: context="rcpt" event="delivered" rcpt="guy@taurix.net" mx="proxmail01.internal.taurix.net" response=Delivered: Code: 250, Enhanced code: 2.1.5, Message: Ok
2024-01-10T10:15:53.229195Z INFO delivery{id=17938066137 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=38862}: smtp::outbound::delivery: Delivery completed. context="queue" event="completed"
2024-01-10T10:15:53.728573Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38524}: utils::listener::listen: context="tls" event="handshake" version=TLSv1_3 cipher=TLS13_AES_256_GCM_SHA384
2024-01-10T10:15:53.730782Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38524}: smtp::queue::spool: Message queued for delivery. context="queue" event="scheduled" id=22233033433 from="guy.vansanden@energiapharma.be" nrcpts=1 size=39723
2024-01-10T10:15:53.786540Z INFO delivery{id=22233033433 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=39723}:attempt{domain="taurix.net" attempt_number=0}: smtp::outbound::session: context="rcpt" event="delivered" rcpt="guy@taurix.net" mx="proxmail01.internal.taurix.net" response=Delivered: Code: 250, Enhanced code: 2.1.5, Message: Ok
2024-01-10T10:15:53.786812Z INFO delivery{id=22233033433 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=39723}: smtp::outbound::delivery: Delivery completed. context="queue" event="completed"
2024-01-10T10:15:54.280592Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38534}: utils::listener::listen: context="tls" event="handshake" version=TLSv1_3 cipher=TLS13_AES_256_GCM_SHA384
2024-01-10T10:15:54.283175Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38534}: smtp::queue::spool: Message queued for delivery. context="queue" event="scheduled" id=26528000730 from="guy.vansanden@energiapharma.be" nrcpts=1 size=40563
2024-01-10T10:15:54.315221Z INFO delivery{id=26528000730 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=40563}:attempt{domain="taurix.net" attempt_number=0}: smtp::outbound::session: context="rcpt" event="delivered" rcpt="guy@taurix.net" mx="proxmail01.internal.taurix.net" response=Delivered: Code: 250, Enhanced code: 2.1.5, Message: Ok
2024-01-10T10:15:54.315575Z INFO delivery{id=26528000730 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=40563}: smtp::outbound::delivery: Delivery completed. context="queue" event="completed"
2024-01-10T10:15:54.820417Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38544}: utils::listener::listen: context="tls" event="handshake" version=TLSv1_3 cipher=TLS13_AES_256_GCM_SHA384
2024-01-10T10:15:54.822613Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38544}: smtp::queue::spool: Message queued for delivery. context="queue" event="scheduled" id=30822968026 from="guy.vansanden@energiapharma.be" nrcpts=1 size=41424
2024-01-10T10:15:54.878706Z INFO delivery{id=30822968026 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=41424}:attempt{domain="taurix.net" attempt_number=0}: smtp::outbound::session: context="rcpt" event="delivered" rcpt="guy@taurix.net" mx="proxmail01.internal.taurix.net" response=Delivered: Code: 250, Enhanced code: 2.1.5, Message: Ok
2024-01-10T10:15:54.878953Z INFO delivery{id=30822968026 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=41424}: smtp::outbound::delivery: Delivery completed. context="queue" event="completed"
2024-01-10T10:15:55.412721Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38546}: utils::listener::listen: context="tls" event="handshake" version=TLSv1_3 cipher=TLS13_AES_256_GCM_SHA384
2024-01-10T10:15:55.415177Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38546}: smtp::queue::spool: Message queued for delivery. context="queue" event="scheduled" id=35117935323 from="guy.vansanden@energiapharma.be" nrcpts=1 size=42264
2024-01-10T10:15:55.430379Z INFO delivery{id=35117935323 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=42264}:attempt{domain="taurix.net" attempt_number=0}: smtp::outbound::session: context="rcpt" event="delivered" rcpt="guy@taurix.net" mx="proxmail01.internal.taurix.net" response=Delivered: Code: 250, Enhanced code: 2.1.5, Message: Ok
2024-01-10T10:15:55.430612Z INFO delivery{id=35117935323 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=42264}: smtp::outbound::delivery: Delivery completed. context="queue" event="completed"
2024-01-10T10:15:55.958968Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38550}: utils::listener::listen: context="tls" event="handshake" version=TLSv1_3 cipher=TLS13_AES_256_GCM_SHA384
2024-01-10T10:15:55.961241Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38550}: smtp::queue::spool: Message queued for delivery. context="queue" event="scheduled" id=39412902619 from="guy.vansanden@energiapharma.be" nrcpts=1 size=43125
2024-01-10T10:15:56.034725Z INFO delivery{id=39412902619 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=43125}:attempt{domain="taurix.net" attempt_number=0}: smtp::outbound::session: context="rcpt" event="delivered" rcpt="guy@taurix.net" mx="proxmail01.internal.taurix.net" response=Delivered: Code: 250, Enhanced code: 2.1.5, Message: Ok
2024-01-10T10:15:56.035016Z INFO delivery{id=39412902619 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=43125}: smtp::outbound::delivery: Delivery completed. context="queue" event="completed"
2024-01-10T10:15:56.528346Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38558}: utils::listener::listen: context="tls" event="handshake" version=TLSv1_3 cipher=TLS13_AES_256_GCM_SHA384
2024-01-10T10:15:56.530652Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38558}: smtp::queue::spool: Message queued for delivery. context="queue" event="scheduled" id=43707869916 from="guy.vansanden@energiapharma.be" nrcpts=1 size=43965
2024-01-10T10:15:56.558973Z INFO delivery{id=43707869916 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=43965}:attempt{domain="taurix.net" attempt_number=0}: smtp::outbound::session: context="rcpt" event="delivered" rcpt="guy@taurix.net" mx="proxmail01.internal.taurix.net" response=Delivered: Code: 250, Enhanced code: 2.1.5, Message: Ok
2024-01-10T10:15:56.559252Z INFO delivery{id=43707869916 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=43965}: smtp::outbound::delivery: Delivery completed. context="queue" event="completed"
2024-01-10T10:15:57.052444Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38568}: utils::listener::listen: context="tls" event="handshake" version=TLSv1_3 cipher=TLS13_AES_256_GCM_SHA384
2024-01-10T10:15:57.054805Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38568}: smtp::queue::spool: Message queued for delivery. context="queue" event="scheduled" id=48002837213 from="guy.vansanden@energiapharma.be" nrcpts=1 size=44826
2024-01-10T10:15:57.123474Z INFO delivery{id=48002837213 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=44826}:attempt{domain="taurix.net" attempt_number=0}: smtp::outbound::session: context="rcpt" event="delivered" rcpt="guy@taurix.net" mx="proxmail01.internal.taurix.net" response=Delivered: Code: 250, Enhanced code: 2.1.5, Message: Ok
2024-01-10T10:15:57.123752Z INFO delivery{id=48002837213 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=44826}: smtp::outbound::delivery: Delivery completed. context="queue" event="completed"
2024-01-10T10:15:57.628721Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38570}: utils::listener::listen: context="tls" event="handshake" version=TLSv1_3 cipher=TLS13_AES_256_GCM_SHA384
2024-01-10T10:15:57.631501Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38570}: smtp::queue::spool: Message queued for delivery. context="queue" event="scheduled" id=52297804509 from="guy.vansanden@energiapharma.be" nrcpts=1 size=45666
2024-01-10T10:15:57.646880Z INFO delivery{id=52297804509 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=45666}:attempt{domain="taurix.net" attempt_number=0}: smtp::outbound::session: context="rcpt" event="delivered" rcpt="guy@taurix.net" mx="proxmail01.internal.taurix.net" response=Delivered: Code: 250, Enhanced code: 2.1.5, Message: Ok
2024-01-10T10:15:57.647134Z INFO delivery{id=52297804509 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=45666}: smtp::outbound::delivery: Delivery completed. context="queue" event="completed"
2024-01-10T10:15:58.159436Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38584}: utils::listener::listen: context="tls" event="handshake" version=TLSv1_3 cipher=TLS13_AES_256_GCM_SHA384
2024-01-10T10:15:58.161594Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38584}: smtp::queue::spool: Message queued for delivery. context="queue" event="scheduled" id=56592771806 from="guy.vansanden@energiapharma.be" nrcpts=1 size=46527
2024-01-10T10:15:58.232693Z INFO delivery{id=56592771806 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=46527}:attempt{domain="taurix.net" attempt_number=0}: smtp::outbound::session: context="rcpt" event="delivered" rcpt="guy@taurix.net" mx="proxmail01.internal.taurix.net" response=Delivered: Code: 250, Enhanced code: 2.1.5, Message: Ok
2024-01-10T10:15:58.232975Z INFO delivery{id=56592771806 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=46527}: smtp::outbound::delivery: Delivery completed. context="queue" event="completed"
2024-01-10T10:15:58.744764Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38594}: utils::listener::listen: context="tls" event="handshake" version=TLSv1_3 cipher=TLS13_AES_256_GCM_SHA384
2024-01-10T10:15:58.747246Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38594}: smtp::queue::spool: Message queued for delivery. context="queue" event="scheduled" id=60887739102 from="guy.vansanden@energiapharma.be" nrcpts=1 size=47367
2024-01-10T10:15:58.762515Z INFO delivery{id=60887739102 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=47367}:attempt{domain="taurix.net" attempt_number=0}: smtp::outbound::session: context="rcpt" event="delivered" rcpt="guy@taurix.net" mx="proxmail01.internal.taurix.net" response=Delivered: Code: 250, Enhanced code: 2.1.5, Message: Ok
2024-01-10T10:15:58.762743Z INFO delivery{id=60887739102 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=47367}: smtp::outbound::delivery: Delivery completed. context="queue" event="completed"
2024-01-10T10:15:59.273856Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38602}: utils::listener::listen: context="tls" event="handshake" version=TLSv1_3 cipher=TLS13_AES_256_GCM_SHA384
2024-01-10T10:15:59.276244Z INFO session{instance="smtp" protocol=Smtp remote.ip="10.250.0.37" remote.port=38602}: smtp::queue::spool: Message queued for delivery. context="queue" event="scheduled" id=65182706399 from="guy.vansanden@energiapharma.be" nrcpts=1 size=48228
2024-01-10T10:15:59.329902Z INFO delivery{id=65182706399 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=48228}:attempt{domain="taurix.net" attempt_number=0}: smtp::outbound::session: context="message" event="rejected" mx="proxmail01.internal.taurix.net" reason=Code: 554, Enhanced code: 5.4.0, Message: Error: too many hops
2024-01-10T10:15:59.331140Z INFO delivery{id=65182706399 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=48228}: smtp::queue::spool: Message queued for delivery. context="queue" event="scheduled" id=69477673695 from="<>" nrcpts=1 size=2893
2024-01-10T10:15:59.331245Z INFO delivery{id=65182706399 return_path="guy.vansanden@energiapharma.be" nrcpt=1 size=48228}: smtp::outbound::delivery: Delivery completed. context="queue" event="completed"
2024-01-10T10:15:59.483551Z INFO delivery{id=69477673695 return_path="<>" nrcpt=1 size=2893}:attempt{domain="energiapharma.be" attempt_number=0}: smtp::outbound::session: context="rcpt" event="delivered" rcpt="guy.vansanden@energiapharma.be" mx="proxmail01.internal.taurix.net" response=Delivered: Code: 250, Enhanced code: 2.1.5, Message: Ok
2024-01-10T10:15:59.483833Z INFO delivery{id=69477673695 return_path="<>" nrcpt=1 size=2893}: smtp::outbound::delivery: Delivery completed. context="queue" event="completed"

[mdecimus]

You have a configuration issue either on your DNS or Stalwart that is casing a loop.