On 18.04.25 11:17, Dmytro Alieksieiev via Postfix-users wrote:
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"
strange, according to http://www.postfix.org/postconf.5.html#socketmap_max_reply_size
the maximum reply size is 100k by default.
How exactly are you connecting to postsrsd?
Is your postsrsd configured properly?
What exactly is listening on host "postsrsd" port 10003 ?
What data does is receive and produce?
because this does not look like postfix error but a configuration error,
maybe postsrsd error.
I use postsrd without problems.
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:
Since "socketmap:inet:postsrsd:10003:reverse" socketmap produces error
postfix better rejects the connection with temporary error.
This is not a postfix issue.
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.
looks like you are avoiding the problem by creating artifical limits.
--
Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/
Warning: I wish NOT to receive e-mail advertising to this address.
Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
I don't have lysdexia. The Dog wouldn't allow that.
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