[Pkg-exim4-users] batv and sender verification

[Johann Spies]

I am in the process of setting up new mail servers (as you will see
from another question I have posted).

Setup:  3 old mail servers (all Debian) with MX records
        1 new Debian server in evaluation phase with no MX record.

The new setup contained a BATV-mechanism (I have removed it now
temporarily) to block backscatter spam.

I sent out my first question to this list and got the following bounce:

pkg-exim4-users at lists.alioth.debian.org
SMTP error from remote mail server after RCPT TO:<pkg-exim4-users at lists.alioth.debian.org>:
host lists.alioth.debian.org [217.196.43.134]:
550-Verification failed for <prvs=jspies/092037e01f at sun.ac.za>
550-Called:   146.232.64.13
550-Sent:     RCPT TO:<prvs=jspies/092037e01f at sun.ac.za>
550-Response: 550 restricted characters in address
550 Sender callout failed: Sender adress can't be verified trough SMTP check.

What happened here was that 146.232.64.13, one the old servers, was
called to verify the sender and the sender verification failed.

Am I correct to assume that I will only be able to implement BATV
successfully when I can do it on all the mail servers?  Or will I have
sender verification problems anyhow?

Regards
Johann
-- 
Johann Spies          Telefoon: 021-808 4036
Informasietegnologie, Universiteit van Stellenbosch

     "That at the name of Jesus every knee should bow, of 
      things in heaven, and things in earth, and things 
      under the earth; And that every tongue should confess 
      that Jesus Christ is Lord, to the glory of God the 
      Father."              Philippians 2:10,11