Hi,
I have an Exim mail server (4.43, CentOS 4, "myserver.example") which tries to
send a mail to a remote server by SMTP. This remote server ("mail.example.com")
rejects the sender address with "554 5.1.0 Sender Denied" because the admins
blacklisted the sender address.
I expected that my Exim would generate a bounce message immediately. But on my
mail server the behavior is different: Exim just treats the error as temporary
and tries to deliver the message again at a later time...
My driver is extremely simple:
remote_smtp:
driver = smtp
I suspect the unwanted behavior is because the remote host is not particularly
friendly to my Exim as the log shows:
------------------------------------------------------------------------------------
SMTP<< 220 mail.example.com Microsoft ESMTP MAIL Service, Version:
6.0.3790.1830 ready at Sun, 12 Aug 2007 12:22:42 +0200
SMTP>> EHLO myserver.example
SMTP<< 250-mail.example.com Hello [10.10.1.1]
250-TURN
250-SIZE
250-ETRN
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-8bitmime
250-BINARYMIME
250-CHUNKING
250-VRFY
250-X-EXPS GSSAPI NTLM LOGIN
250-X-EXPS=LOGIN
250-AUTH GSSAPI NTLM LOGIN
250-AUTH=LOGIN
250-X-LINK2STATE
250-XEXCH50
250 OK
using PIPELINING
SMTP>> MAIL FROM:<sender@???> SIZE=40008
SMTP>> RCPT TO:<recipient@???>
SMTP>> DATA
SMTP<< 554 5.1.0 Sender Denied
ok=0 send_quit=1 send_rset=1 continue_more=0 yield=1 first_address is not NULL
SMTP>> QUIT
send failed: Broken pipe
LOG: MAIN
SMTP error from remote mailer after MAIL FROM:<sender@???>
SIZE=40008: host mail.example.com [192.168.1.1]: 554 5.1.0 Sender Denied:
Connection reset by peer
set_process_info: 26357 delivering 1IJtUV-0005LZ-TB: just tried mail.example.com
[192.168.1.1] for recipient@???: result DEFER
------------------------------------------------------------------------------------
You can see that the remote host immediately closes the connection after sending
"554 5.1.0 Sender Denied". Does that explain why Exim treats this as a temporary
failure?
(Exim shows the correct behavior when talking to another Exim mail server which
does not close the connection immediately.)
Can enable some options in Exim to work around the problem?
fs
