Test Email not sending even though settings are correct!

 
I have been trying for the longest time to get an email sent when my alert goes off. I got the coding correct but not MT4 will not allow the email to be sent. Configured the settings to exactly what they are supposed to be and says that login to (sever) failed. A few months ago, these same settings were working just fine. now they do not work. any ideas what I should try next?
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