On 4/28/2023 8:59 AM, Gerd Hoerst via Postfix-users wrote:
Hi !
question 1st : is it a good idea to reject any email which is not
sent from a domain (means sen...@domain.tld) any other like
sen...@sub.domain.tld or sub.sub.domain.tld is rejected ?
That seems like a bad idea, extremely likely to reject legit mail.
at least i tried with header checks in pcre
/^From:\.*@.*\.*\.*/ DISCARD NO SUBDOMAINS
but this seemd not to work..
The regexp is wrong. You can test expressions with postmap.
DISCARD is a poor choice here, since legit senders won't be
notified. Start with INFO to log what matches, then if you're happy
with the results and feeling particularly reckless, move to REJECT.
i have several anti spam feature enabled but i get still some
messages which are coming from subdomains or sub sub domains
I've seen no evidence that the presence of a subdomain is a reliable
spam indicator. Zero false positives is a much better goal than zero
spam.
-- Noel Jones
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