Sheffielder Posted December 14, 2016 Share Posted December 14, 2016 A test email could not be sent. Check the settings entered are correct or contact your hosting or SMTP provider for more information. 535 Incorrect authentication data Anyone getting this recently? I made no changes to server or to mandrillapp and all of a sudden all emails ceased with this error message Link to comment Share on other sites More sharing options...
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