Thanks for the answer.  I've never heard that one before.

I remember once I used a 3rd party component set (Indy 9) to do some smtp alert emails from a Windows application. Couldn't get the mails to go through for a few particular customers and after some research and talking to ISP's, we found out that the component set that I used was used to write spamming software and the headers produced by the component set were flagged by spamm assasin and others. Arg.



Mail admins usually treat non-MTA software that send email as highly potential sources of spam. In your case, a whitelisting arrangement would take care of the problem or whatever arrangement they may have.

Properly managed ISP's/domains will have a reachable contact at [EMAIL PROTECTED]/domain.

The third party component set you mentioned...is it the original of indyproject.org too?

The Indy 9 component most probably got itself into blacklists because of the IntraWeb framework, which most probably uses Indy 9 for smtp, has inadequate measures against abuse and the Indy 9 component creates an easily identifiable header.

Whole server farms running proper MTA software will get blacklisted if they have abusable scripts or other stuff using them.


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