Hi,
In the mail server logs, I found:
2024-07-19 10:39:16 1sUl13-00EJCh-1P ** andy.arvid@gmail.com R=outbound T=remote_smtp H=gmail-smtp-in.l.google.com [2a00:1450:400c:c04::1a] X=TLS1.3:ECDHE_X25519__ECDSA_SECP256R1_SHA256__AES_256_GCM:256 CV=yes: SMTP error from remote mail server after end of data: 550-5.7.1 [2a01:4f8:160:83c4::8 19] Gmail has detected that this message is\n550-5.7.1 likely suspicious due to the very low reputation of the sending\n550-5.7.1 domain. To best protect our users from spam, the message has been\n550-5.7.1 blocked. For more information, go to\n550 5.7.1 https://support.google.com/mail/answer/188131 ffacd0b85a97d-368786b3865si463916f8f.529 - gsmtp
This is from sending my prior mail from a GMail account. The " common-lisp.net" domain has a High (=highest) domain reputation and the IP reputation is not published, but also not referred to. So I can nothing but conclude this must be the @gmail.com address that I'm sending from that's triggering this response?
How can I fight this?!