More mailserver probe fixes #579
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A few things here: 1. Increase the `stmp_starttls` timeout. We're seeing probes sporadically fail against ImprovMX with "i/o timeout". (see logs below) 2. Add missing port for probing `umbriel` (oops). 3. Also alert on `umbriel` probe failures. ImprovMX probe logs: ``` ts=2025-03-10T16:27:37.785620787Z caller=main.go:190 module=smtp_starttls target=mx2.improvmx.com:25 level=info msg="Beginning probe" probe=tcp timeout_seconds=5 ts=2025-03-10T16:27:37.785744902Z caller=tcp.go:40 module=smtp_starttls target=mx2.improvmx.com:25 level=info msg="Resolving target address" target=mx2.improvmx.com ip_protocol=ip6 ts=2025-03-10T16:27:37.823984377Z caller=tcp.go:40 module=smtp_starttls target=mx2.improvmx.com:25 level=info msg="Resolved target address" target=mx2.improvmx.com ip=2a05:d012:412:e202:e81e:cc44:3b53:8a 3d ts=2025-03-10T16:27:37.824035793Z caller=tcp.go:112 module=smtp_starttls target=mx2.improvmx.com:25 level=info msg="Dialing TCP without TLS" ts=2025-03-10T16:27:37.980888559Z caller=handler.go:119 module=smtp_starttls target=mx2.improvmx.com:25 level=info msg="Successfully dialed" ts=2025-03-10T16:27:37.980965545Z caller=handler.go:119 module=smtp_starttls target=mx2.improvmx.com:25 level=info msg="Processing query response entry" entry_number=0 ts=2025-03-10T16:27:42.293492984Z caller=handler.go:119 module=smtp_starttls target=mx2.improvmx.com:25 level=debug msg="Read line" line="220 mx2.improvmx.com Welcome to ImprovMX mail server v3. - Improv MX v2024.06.06" ts=2025-03-10T16:27:42.293596408Z caller=handler.go:119 module=smtp_starttls target=mx2.improvmx.com:25 level=info msg="Regexp matched" regexp=^220 line="220 mx2.improvmx.com Welcome to ImprovMX mail ser ver v3. - ImprovMX v2024.06.06" ts=2025-03-10T16:27:42.293617839Z caller=handler.go:119 module=smtp_starttls target=mx2.improvmx.com:25 level=info msg="Processing query response entry" entry_number=1 ts=2025-03-10T16:27:42.293631825Z caller=handler.go:119 module=smtp_starttls target=mx2.improvmx.com:25 level=debug msg="Sending line" line="EHLO prober\r" ts=2025-03-10T16:27:42.293683932Z caller=handler.go:119 module=smtp_starttls target=mx2.improvmx.com:25 level=info msg="Processing query response entry" entry_number=2 ts=2025-03-10T16:27:42.786519394Z caller=handler.go:119 module=smtp_starttls target=mx2.improvmx.com:25 level=error msg="Error reading from connection" err="read tcp6 [2a01:4ff:1f0:ad06::]:39860->[2a05:d 012:412:e202:e81e:cc44:3b53:8a3d]:25: i/o timeout" ts=2025-03-10T16:27:42.786645963Z caller=main.go:190 module=smtp_starttls target=mx2.improvmx.com:25 level=error msg="Probe failed" duration_seconds=5.000976894 ```
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A few things here:
stmp_starttlstimeout. We're seeing probes sporadically fail against ImprovMX with "i/o timeout". (see logs below)umbriel(oops).umbrielprobe failures.ImprovMX probe logs: