Sunday, January 15, 2012

Incoming E-Mails with Attachments Failed - "Message size exceeds fixed maximum message size"

In Nintex workflows, some of the alert mails were failed! further investigating found this issue happens only on notification mails with attachments of 1MB+.

Moreover, There was a event logged in Event Log:
System.Net.Mail.SmtpException: Exceeded storage allocation. The server response was: 5.3.4 Message size exceeds fixed maximum message size.
System.Net.Mail.SmtpException: Exceeded storage allocation. The server response was: 5.3.4 Message size exceeds fixed maximum message size.

Checked the Exchange Server Message size limits, It was 20MB but still unable to send mails with 2MB!
After bit googling, found the issue: SMTP Server settings.
Exceeded storage allocation SMTP Settings

 After increasing the Message Size & Session Size, everything turned to good.



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