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. Checked the Exchange…

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