24/7 U.S. Support – 877-595-4482
2012-09-07 1:35 pm
Typically this error occurs when an email client is not authenticating with the SMTP server. The sender will want to ensure they have the SMTP authentication setting activated within their email client. In this case, it may need additional code settings and variables (for email account username and password) in the code to do the SMTP authentication check.
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