Here are some of my takeaways from this post by Anne P. Mitchell about deliverability:
Increasing email deliverability is both an art and a science, and to really get results, you need to have some expertise in both.
But there are some fairly simple things that you can do on your own to help monitor and boost your email deliverability. Here are three things that you can do that can make a big difference to your email delivery, and all they will cost you is your time:
1. Open test accounts at each of the major free webmail hosts, such as Hotmail and Yahoo, and add them to your mailing lists.
2. Run your email through a spam filter like Spam Assassin before you send it!
3. Keep it Simple: One of the biggest problems that legitimate email senders run into is trying to make a single email do too much. So they put tons of unnecessary HTML and lots of links in their email, without realizing that the more they put in, the harder it is for that poor little email to run the gamut of spam checkers and filters, and to get to the inbox.
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