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Bouncing Emails floodiing server

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Hi I'm having trouble with outgoing emails from the forum? They appear to be lacking headers needed to properly authenticate an email so all emails are bouncing and flooding my mail server. Example of a bounce back from Google: Can someone help me with this?


Remote-MTA: dns; gmail-smtp-in.l.google.com
Diagnostic-Code: smtp; 550-5.7.1 [] Messages missing a valid messageId header are not
 550 5.7.1 accepted. i8-20020a255408000000b006a67418438esi2635962ybb.421 - gsmtp



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