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You need to test the service against mailboxes at AOL, Yahoo, Gmail and Hotmail as well as against mailboxes protected by major spam filters.
Even using a bulk service you need to be aware of features in messages that trigger warnings in major filters.
So far I have done most of the things I can ask my sysadmin to do, now I am looking at some optimization (if possible)
- Email encoding, Latin vs UTF8
- Valid from address : is it important?
- Proper email header, mailer name?
- Similarity in email's content for different clients
anyone want to share?