A SPAM filter is triggered by many factors. Most common is Server IP marked as spam by email providers (in case it is/was used to send spam emails).
a. Try to change the sender email and you can also make emails in HTML (but do not add many images). This can be done with Better Emails plugin – http://wpestate.org/forums/topic/emails-are-not-sent/
b. Try to test different email providers (not your server email). You can try to test with MANDRILL API and see if that makes a different. Help – http://wpestate.org/forums/topic/emails-are-not-sent/
Lastly – changing text itself can be done with POEDIT (so you do not modify code). Help http://wpestate.org/forums/topic/use-poedit/
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