Hello. I'm running OpenSMTPD 7.8.0 on OpenBSD 7.8-current.
Some emails from a particular sender (originating from more one one IP address) are being rejected with a 451 error:
Jan 19 20:23:19 franz smtpd[56169]: a1a922108d847ea8 smtp connected address=50.31.36.135 host=pnkfnqvt.outbound-mail.sendgrid.net Jan 19 20:23:19 franz smtpd[56169]: a1a922108d847ea8 smtp tls ciphers=TLSv1.3:TLS_AES_256_GCM_SHA384:256 Jan 19 20:23:20 franz smtpd[56169]: a1a922108d847ea8 smtp failed-command command="DATA" result="451 Try again later" Jan 19 20:23:20 franz smtpd[56169]: a1a922108d847ea8 smtp disconnected reason=quit
This is not a general problem, as emails from other senders are being accepted normally. spamd is not a factor.
Might anyone be able to suggest how I can troubleshoot this issue? Many thanks in advance.
