1. Blacklisting in RBL/DNSBLs Server (use robtex.com to check)
2. Absence of PTR Record.
3. Wrong SMTP Banner.
4. Subnet may be in a pool which has mail server as open relay server (very
common).
5. SPF Record.
6. The Server may be a real source of SPAM (quite possible that you are really
spamming).
7. Proper CNAME if A Record is something else.
8. Opt In and Opt Out option for Subscribers if you are using the mail server
for Email Marketing.
9. For complete consultancy and solution, user needs to pay me [Commercial].
----------------
Great, please explain these items being the reasons for being dumped as SPAM -
Blacklisting in RBL/DNSBLs Server (why did it end up in spam was the question
to begin with, chicken or the egg first.)
Wrong SMTP Banner. What significance does it have except legal.
SPF Record (20% utilization as of 2008).
The Server may be a real source of SPAM (how do you determine this in absence
of other facts mentioned.)
Proper CNAME if A Record is something else. Whose CNAME and A records, please
elaborate.
Opt In and Opt Out options. - Really? I get dumped in SPAM because SMTP server
didn't find Opt-in, Opt-out in my email body? Now that's scary I think. How
does SMTP server determine if my email was a marketing email or not. Your email
didn't go in SPAM either though there was no Opt-out mentioned.
Others are pretty obvious. Correct configuration of Postfix assumes that it is
not open relay, which mostly are not by default. Pay you, yeah that's the
reason.
--Naresh
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