git send-email with ancient SMTP server … dh key too small

From: Matěj Cepl <mcepl@cepl.eu>
Date: Aug 9, 2024, 10:17 UTC
Message-ID: <D3BAXOA4NL74.29XYKS0IO8UFC@cepl.eu>

When using git send-email sending to very ancient SMTP server (postfix 2.6.6 on CentOS 6), I get this error:

STARTTLS failed! SSL connect attempt failed error:0A00018A:SSL routines::dh key too small at /usr/libexec/git/git-send-email line 1638.

When looking what seems like a similar error at https://github.com/symfony/symfony/issues/44393 it seems I need to set `security_level` (whatever it is) to 1. Is it possible to do it just with configuration of git or do I need to patch something somewhere?

Thank you for any reply,

Matěj Cepl

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