We did not use a service like milter, but simply used postfix relays at both ends, nor did we use spamassassin.
If these services are used, the problem will be simple. The spam filtering service is not used, but it is judged as spam, so it is strange. Our postfix version is 2.11, and the server system is centos7. 2023-05-12 21:55，Viktor Dukhovni via Postfix-users： > On Fri, May 12, 2023 at 03:32:45PM +0800, lty--- via Postfix-users wrote: > >> Hello The mail is transferred to the postfix service of the relay server >> through the postfix service. Occasionally, the mail will be rejected and the >> message "said: 550 Mail was identified as spam" will be returned. I checked >> the source code and found no similar error message! I cannot reproduce this >> problem, Because it is sporadic. > > The *REMOTE* server rejected the message, with an SMTP response > in which it "said" that the mail was identified as spam. > > Since the problem was reported by the remote system, it is not > surprising that you won't find the message in the Postfix > source code.
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