Re: [Exim] HELO syntax check

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Autor: Marc MERLIN
Data:  
A: Chris Edwards
CC: exim-users
Assumpte: Re: [Exim] HELO syntax check
On Wed, Aug 21, 2002 at 02:28:30PM +0100, Chris Edwards wrote:
> Could be missing something. But haven't found it yet...
>
> Setting helo_verify_hosts checks the HELO string exactly matches the
> reverse DNS of the calling IP, which is *much* stricter. Sadly on today's
> internet this rejects virtually all mail! (perhaps slight exaggeration...)


I wrote this for my servers:

(rcpt ACL)

  # Accept mail to postmaster in any local domain, regardless of the source,
  # and without verifying the sender.
  accept  domains       = +local_domains
          local_parts   = postmaster


  deny  message   = "HELO/EHLO required by SMTP RFC"
        condition = ${if eq{$sender_helo_name}{}{yes}{no}}


  deny  message   = "Invalid domain or IP given in HELO/EHLO"
       !condition = ${if match{$sender_helo_name}{\\\.}{yes}{no}}


Marc
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