>I just setup a new Imail Server and MOSTLY, things are working. But I sure
>am seeing a lot of bounceback (rejected) email. A lot of it is AOL, but not
>all. Any ideas?
>
>Kevin N. Prociw
==================
Kevin,
I helped a guy here yesterday with AOL not accepting his mail (I didn't get
a confirmation that my guess was right, but I found something in DNS
missing for his MAIL FROM: @domain.com) but AOL or many other mail servers,
inreasingly, are implementing quite tight DNS validations on the hostnames
of incoming (to them, from you) mail.
The validations are via DNS lookups and are applied, variously, to these
items their SMTPD servers learn about your mail server and your mail sender
during the SMTP dialog:
1. your mail server's name and ip address
2. HELO/EHLO hostname (not necessesarily the same as one, esp in virtual
mail host servers like Imail)
3. MAIL FROM: @yourdomain.com
The kind of validations that can be done with DNS are:
A. reverse lookup of ip address to see if reverse zone authority for 1.
above is a) done at all and b) correct all way down to you. If your mail
server's ip address, at least, has not been correctly delegated under you
upstream's authority, or delated to you, then a lot of mail servers willl
reject all mail.
B. Do the mail server hostname, HELO/EHMO hostname, and MAIL FROM:
[EMAIL PROTECTED] hostname have : A records and/or MX records? if not,
boom, rejected.
C. Are HELO/EHLO hostname and MAIL FROM: @domain.Com both FQHN's 'fully
qualified host name'.
To see the kind of checking a top flight MTA can apply to the mail you are
trying to deliver to the MTA, look here: http://postfix.eu.org/uce.html
As always, can you post here snippets from your Imail logs so we can see
why AOL is rejecting?
Len
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