Incoming E-Mails with Attachments Failed – “Message size exceeds fixed maximum message size”

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

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 20 MB but still unable to send mails with 2 MB! After a bit of googling, found the issue: SMTP Server settings.

Exceeded storage allocation SMTP Settings

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

Salaudeen Rajack

Salaudeen Rajack - Information Technology Expert with Two-decades of hands-on experience, specializing in SharePoint, PowerShell, Microsoft 365, and related products. He has held various positions including SharePoint Architect, Administrator, Developer and consultant, has helped many organizations to implement and optimize SharePoint solutions. Known for his deep technical expertise, He's passionate about sharing the knowledge and insights to help others, through the real-world articles!

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