I am constantly finding lines like these in my exim logfile:
17:42:56 [6063] 1q9ScJ-0001Zn-SJ DKIM: d=slack.com s=s4xolb5s7tnx6yxtrm4adems7glgsuyf c=relaxed/simple a=rsa-sha256 t=1686757138 [invalid - public key record (currently?) unavailable]
17:42:56 [6063] 1q9ScJ-0001Zn-SJ DKIM: d=amazonses.com s=224i4yxa5dv7c2xz3womw6peuasteono c=relaxed/simple a=rsa-sha256 t=1686757138 [invalid - public key record (currently?) unavailable]
17:42:56 [6063] 1q9ScJ-0001Zn-SJ DKIM test passed (address=01000188ba8f5fb3-3091cee3-ea59-43bc-a0ef-97ab87419b59-000000@mail.slack.com domain=slack.com), but signature is invalid.
17:42:56 [6063] 1q9ScJ-0001Zn-SJ DKIM test passed (address=01000188ba8f5fb3-3091cee3-ea59-43bc-a0ef-97ab87419b59-000000@mail.slack.com domain=amazonses.com), but signature is invalid.
17:42:56 [6063] 1q9ScJ-0001Zn-SJ TLS error on connection from a35-21.smtp-out.amazonses.com [54.240.35.21]:42401 I=[<my-ip>]:25 (recv): The TLS connection was non-properly terminated.
17:42:56 [6063] 1q9ScJ-0001Zn-SJ SMTP connection lost after final dot H=a35-21.smtp-out.amazonses.com [54.240.35.21]:42401 I=[<my-ip>]:25 P=esmtps
According to https://serverfault.com/a/932770/142936 the last line should mean that the email has already been delivered; however, none of the mails ever show up in my inbox. No, they’re not spam, either. It’s basically every mail from Slack, from Amazon themselves, and a couple of other services that don’t run their own email servers anymore. Other large email services, like Gmail, have no trouble at all delivering mails to my server.
I suspect that the second-to-last line somehow plays in role in this, I just have no idea how to debug this any further… is there something I can do? Does Amazon have to fix their SES? Will I never get any mails from Amazon SES anymore? ?