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Preventing gmail to mark our mails as spam

, 29 Feb 2012 CPOL
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Rencently I've discovered the reason why all the mail messages sent by my Web app were putted on spam folder when the "to" header ends with "@gmail.com".

You must include "Message-Id" header or your message will be treated as spam by Google.

This is the easy way to do this with System.Net.Mail.MailMessage Class:
Message.Headers.Add("Message-Id", String.Concat("<", Now.ToString("yyMMdd"), ".", Now.ToString("HHmmss"), "@yourdomain.com>" ))

And that's all (obviusly you must follow the Google recommendations too).

Wish to save at least the same time that I spent resolving this to many of you.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Santiago Santos Cortizo
Software Developer (Senior) Agildata Sistemas
Spain Spain
Software developer since 1985

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