What must one do to avoid Gmail's retarded non-spam filtering?

[johnl at iecc.com (John Levine)]

>We have proper A+PTR records on the edge MTAs, proper SPF records for
>the originating domain, proper Return-Path and other headers, and so
>on. There isn't anything that I can think of other than the content
>itself which would be abnormal, and obviously the content is
>repetitive and can't be changed much. Is there something obvious
>which we've missed?

What else goes out from that MTA?  User forwarded mail?  Mailing lists?
random customer junk?

It is a really good idea to separate your mail streams.  These days it
means separate IPs for users, transactions, forwards, and such,
eventually different DKIM signatures will do the trick.

R's,
John