Recently my email has been getting flagged by a lot of spam filters. I don’t spam, I don’t even send out bulk emails through my account so I had no idea why this was happening.
I finally received a bounce back message that stated: The error that the other server returned was: 550 550 5.7.1 Message rejected due to content restrictions (state 17).
In my signature I had links to my website, my twitter page and my linkedIn page. I removed these and now it goes through fine. This have proven to work with a few people who complained of not getting my emails.
If you’re email isn’t getting through, trying removing links.