[Exim] Feature request: 'sender_helo_name' ACL condition

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How about adding the following ACL condition:
     sender_helo_name = <domain list>

That way, you could add something like the following in an ACL:

     acl_check_helo:
          accept hosts = : +relay_from_hosts

          deny message = Do not pretend to be me, impostor!
              sender_helo_name = +local_domains

Currently, one can do the following (as I do):

     acl_check_helo:
          accept hosts  = : +relay_from_hosts

          deny message  = Give me your name, not an IP address
              condition = ${if isip {$sender_helo_name}{yes}{no}}

          deny message  = Go away, impostor!
              condition = ${if eq
{$sender_helo_name}{$primary_hostname}{yes}{no}}

However, this only catches the primary host name (in my case,
'net.slett.net'), not the domains for which the machine is configured
to handle mail ('slett.net'...)


Good? Bad? Ugly?
I would not mind writing a patch to accomplish this, if noone else
wants to and noone thinks it is not a good idea. (How's that for
triple negatives? :)

-tor
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