Hi community,
I get a bit annoying spam lately to rcpts like
<1239123129381239...@example.com> where localpart is bunch of numbers
and just localpart alone length is more then 300 chars.
https://datatracker.ietf.org/doc/html/rfc5321#section-4.5.3.1.1 says
"The maximum total length of a user name or other local-part is 64 octets."
https://datatracker.ietf.org/doc/html/rfc5321#section-4.5.3.1.3 says
"The maximum total length of a reverse-path or forward-path is 256
octets (including the punctuation and element separators)." as I
understand it's about max length of one address used in "MAIL FROM" or
"RCPT TO".
Postfix accepts such envelopes but then:
Apr 18 07:42:00 hostname postfix/smtpd[617913]: warning:
socketmap:inet:postsrsd:10003:reverse socketmap server permanent error:
Too big.
Apr 18 07:42:00 hostname postfix/smtpd[617913]: warning:
socketmap:inet:postsrsd:10003:reverse lookup error for
"1232....@example.com"
Apr 18 07:42:00 hostname postfix/smtpd[617913]: NOQUEUE: reject: RCPT
from unknown[192.0.2.96]: 451 4.3.5 Server configuration error;
from=<double-bounce@hostname> to=<1232....@example.com> proto=ESMTP
helo=<sender>
Which result in infinity errors. I want to clarify is this is desired
configuration out of the box? And is using stuff like is a proper way to
apply restrictions that not set by default:
smtpd_recipient_restrictions =
check_recipient_access
regexp:/etc/postfix/recipient_address_length_restrictions
...
/etc/postfix/recipient_address_length_restrictions
/^.{38,}@/ 554 5.1.7 Recipient address rejected: Localpart is too long.
38 chars and greater chosen due to SRS need also some space.
--
Regards,
Dmytro Alieksieiev
DevOps Engineer
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