On 2011-08-29 at 15:24 +0200, tower wrote:
> Can You tell me what can I do to be unblacklisted in gmail spam filter?
> For one week ago I had open mail system and some spam passed from one of
> my servers. Today I filled out the form at
> http://mail.google.com/support/bin/request.py?contact_type=msgdelivery&&hl=en
> <http://mail.google.com/support/bin/request.py?contact_type=msgdelivery&&hl=en>.
> Can I do something more?
(1) Read Todd Lyon's response. It's sound.
(2) Set up DKIM. Without DKIM, the only distinguishing signal to Gmail
is the source IP, and if you yourself are not sending enough mail,
you can get lumped in with the /24 you're in.
With DKIM, you also provide a per-domain signal. You might still
not generate enough mail to establish a tracked reputation, but
there's a reasonable chance you will. This is the only way to
really stand a decent chance of breaking away from a bad
neighbourhood reputation.
(3) Don't just switch IPs without changing behaviour, since that will
just lead to churning through the block, spoiling the reputation of
every IP. If your mail flow can be characterised (and trust me, it
can), then a sudden shift of a flow from one IP to a second IP makes
you look like a spammer trying to escape bad reputation. When the
hammer falls, it will fall hard.
-Phil
