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List:       exim-users
Subject:    Re: [exim] Turning off no_enforce_sync conditionally in acl_smtp_helo
From:       Phil Pennock <pdp () exim ! org>
Date:       2017-03-27 19:10:56
Message-ID: 20170327191056.GA45034 () tower ! spodhuis ! org
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On 2016-05-04 at 14:52 -0500, Jason L Tibbitts III wrote:
> One possibility is to just use:
> 
> acl_check_helo:
>   accept hosts = :
>   accept control = no_enforce_sync
> 
> which appears to work.  But can I turn it off just for Thunderbird's
> probes?  I tried the following, but it doesn't appear to work:
> 
> acl_check_helo:
>   accept hosts = :
>   accept condition = ${if eq{$sender_helo_name}{we-guess.mozilla.org} {true}}
>          control = no_enforce_sync
>          logwrite = Turning off sync enforcement for Thunderbird.
>   accept

Sync enforcement is done as part of figuring out what the incoming SMTP
verb is, long before ACLs are applied.  The ACL for a given command can
not affect whether or not sync enforcement applies to _that_ command.

I suggest using a _connect_ time ACL to set `control = no_enforce_sync`
and then use the _HELO_ time ACL to re-apply `control = enforce_sync`
if _not_ Thunderbird.

-Phil

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