Re: [Exim] acl_smtp_helo question

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Autor: Chris Edwards
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A: Kyle Dippery
CC: Exim Mailing List
Assumpte: Re: [Exim] acl_smtp_helo question
| But at one point I telnetted to my server to test it, and
| noticed that if I ignored the "Bad HELO:" message and proceeded
| on to "MAIL FROM:", I was able to complete my message normally.

|
| Is this supposed to happen? Or am I mis-understanding something?


This once came as a surprise to us too - the default config allows sending
of mail with no HELO at all. The solution is for the RCPT ACL to check
$sender_helo_name is set:

# some spammers can't be bothered saying HELO

  deny    condition = ${if eq{$sender_helo_name}{}{yes}{no}}
    message = RFCs mandate HELO/EHLO before mail can be sent


This works because $sender_helo_name is empty if no (valid) HELO is given.

FWIW, now I look, this test rarely triggers here nowadays.

Chris


--
Chris Edwards, Glasgow University Computing Service