Sender Verification Callouts, will this work.

[jols]

We continue to be dinged for NDR via Lashback due to -0500 X-Failed-Recipients.

This occurs even though we have configured exim to not include the subject line, nor anything from the body copy of the original message.

So I'm apparently left with only one two choices:

1 - Filter out all outbound and incoming email with "X-Failed-Recipients" in the header.

or

2 - Switch on Sender Verification Callouts so that spam email (connections) is rejected rather than bounced.

But then I read pages like this:

http://thepileof.blogspot.com/2012/04/exim-sender-verification-callouts-dont.html

So what's the best approach here?


Also, by the way, I am not sure how to filter just outbound email, which would be preferable over filtering "X-Failed-Recipients" in both in and out. The only global filtering method I've been able to find is by using the antivirus.exim file, but this filters in both directions.

So my other question would be: Does anyone know how to filter just-and-only outbound email , e.g. that contains "X-Failed-Recipients" in the header?

Thanks much.

 

[cPanelMichael]

Hello,

One aspect to keep in mind is that using sender verification callouts is supported, whereas a custom filter rule is unsupported. Also, you may want to consider posting to the Exim users mailing list for help with created advanced custom Exim filtering rules:

Exim Users Mailing List

Thank you.

 

[jols]

Thanks.

Supported yes, but http://thepileof.blogspot.com/2012/04/exim-sender-verification-callouts-dont.html
... seems to indicate that verification callouts will get your server blacklisted faster than most anything else.

 

[cPanelMichael]

Yes, that's certainly possible. You can search for the term "callouts" on our forums here and you will see a few threads where this is discussed.

Thank you.