(dv) Hotmail and Yahoo mail spam flagging issue
Overview
Symptom: An increase in emails from (dv) servers being flagged as spam by hotmail, yahoo and other major mail service providers. It seems that they are starting to perform PTR record checks on the server name.
NOTE:
We strongly recommend using SPF records or DomainKeys to fix this issue. The following instructions will only fix a primary domain for a (dv) server. If you have more than one domain on your (dv), it is better to use an SPF Record to fix this issue.
Instructions
For example
(dv) server is sending mail as mail.example.com. When the receiving mail server performs a reverse PTR lookup, it finds example.com MISMATCH. The solution would then be to tell qmail that it is sending mail as domain.com instead of mail.example.com.
Here is the fix
echo example.com > /var/qmail/control/me
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