Emails from GitLab don't have DKIM signatures
not a critical issue, but something that would be nice to have in terms of getting through spam filters
from mailserver logs:
2022-03-13T00:15:00.286Z smtp: incoming message {"msg_id":"5b29fa42","sender":"gitlab@alpinelinux.org","src_host":"nld3-dev1.alpinelinux.org","src_ip":"147.75.101.119:48042"}
2022-03-13T00:15:00.953Z smtp: RCPT ok {"msg_id":"5b29fa42","rcpt":"alpine@ptrcnull.me"}
2022-03-13T00:15:00.967Z smtp/pipeline: no check action {"check":"check.dkim","msg_id":"5b29fa42","reason":"No DKIM signatures","smtp_code":550,"smtp_enchcode":"5.7.20","smtp_msg":"No DKIM signatures"}
2022-03-13T00:15:01.269Z smtp: accepted {"msg_id":"5b29fa42"}