Author: Philipp Sacha Date: To: Exim Users Mailing List Subject: Re: [exim] Alternate callout verification sequence suggestion
Marc Perkel wrote: > According to the docs - this is the sender callout sequence:
>
> For a sender callout check, Exim makes SMTP connections to the remote
> hosts, to test whether a bounce message could be delivered to the sender
> address. The following SMTP commands are sent:
>
> HELO </primary host name/>
> MAIL FROM:<>
> RCPT TO:</the address to be tested/>
> QUIT
>
> May I suggest something different.
>
> HELO </primary host name/>
> 250 helo MRLRY
> MAIL FROM:<>
> 501 bogus mail from
> # fail detected - try different address
> MAIL FROM: <some real email address - possibly the To: header?>
> 250 OK
> RCPT TO:</the address to be tested/>
> QUIT
>
> This would also return a flag set indicating that the domain rejects
> null senders.
>
> Who likes this idea?
>
> I like this idea. It would be nice to have a parameter for callouts to
set the address given in MAIL FROM. The parameter name could be
something like "callout_mail_from", so that one can define any address
even $h_to.
