Are you running spamassassin or any other spam prevention tools like that?
Brian
On 12/6/2025 9:02 AM, Linkcheck via Postfix-users wrote:
postfix mail_version = 3.7.11 running on a debian bookworm server.
I had no significant problem receiving mail from gmail over the past
several years. During the past two or three weeks gmail (including
googlemail and business domains that use gmail for sending mail) have
failed to deliver SOME mail to our server, which hosts accounts for
about a dozen domains. This, with no alteration by us to the postfix
setup.
Some potential recipients say their correspondants have recived bounce
messages, some haven't - though those may have been due to gmail's
breakdown a couple of weeks ago.
I have looked hard for any comments online and can find only one that
MAY be relevant, from google...
"Gmail may also reject your message for other reasons, like when it
looks like spam to our automated detection systems. When this happens,
you receive a "Message rejected" bounce message."
I infer this refers to evaluation of the gmail-sender's message.
I have spent some time tidying up DNS for my mail server's domains -
removing references to no-longer-available secondary MX, that sort of
thing. Whether this has had any effect it may be too soon to say, but
today I was sent a bounce message for an email that failed on 3rd
December.
As far as I can determine, online mail-server testers show me I have a
good mail server.
My own thoughts include slow access to my servers' DNS; though this is
quick enough a couple of testers show failure to obtain, eg, SPF
records. Sending messages to/from Protonmail never fails, nor does
mail from any server other than google/gmail.
Does anyone have an insight as to what the cause of this may be, please?
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