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albertito / chasquid
95%
master: 95%

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LAST BUILD BRANCH: main
DEFAULT BRANCH: master
Repo Added 25 Feb 2018 12:12PM UTC
Files 45
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LAST BUILD ON BRANCH refs/tags/v1.15.1
branch: refs/tags/v1.15.1
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30 Mar 2025 11:06AM UTC coverage: 94.911% (+0.02%) from 94.895%
14155528902

push

albertito
smtpsrv: Disable TLS session tickets to work around Microsoft problems

Microsoft SMTP servers have a bug that prevents them from successfully
establishing a TLS connection against modern Go TLS servers, and some
OpenSSL versions. It also doesn't fall back to plain-text, so this has
been causing deliverablity issues.

The problem started by the end of 2024 and it's still not fixed.

Unfortunately, because they're quite a big provider and are not fixing
their problem, it is worth to do a server-side workaround.

This patch implements that workaround: it disables TLS session tickets.

There is no security impact for doing so, and there is a small
performance penalty which is likely to be insignificant for chasquid's
main use cases.

This workaround should be removed once Microsoft fixes their problem.

We are going to make a 1.15.1 release for this, which this patch also
documents.

Thanks to Michael (l6d-dev@github) for reporting this issue and
suggesting this workaround!

See https://github.com/albertito/chasquid/issues/64 and
https://github.com/golang/go/issues/70232 for more details.

22 of 22 new or added lines in 1 file covered. (100.0%)

5744 of 6052 relevant lines covered (94.91%)

65614.06 hits per line

Relevant lines Covered
Build:
Build:
6052 RELEVANT LINES 5744 COVERED LINES
65614.06 HITS PER LINE
Source Files on refs/tags/v1.15.1
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  • List 45
  • Changed 1
  • Source Changed 0
  • Coverage Changed 1
Coverage ∆ File Lines Relevant Covered Missed Hits/Line

Recent builds

Builds Branch Commit Type Ran Committer Via Coverage
14155528902 refs/tags/v1.15.1 smtpsrv: Disable TLS session tickets to work around Microsoft problems Microsoft SMTP servers have a bug that prevents them from successfully establishing a TLS connection against modern Go TLS servers, and some OpenSSL versions. It also doesn't ... push 31 Mar 2025 11:06PM UTC albertito
94.91
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