Reject oversized emails

Updated 6 months ago by admin

EMS accepts emails up to 50Mb inbound or outbound. Should your mail server (Domain Route) not accept this size of message, you can reject the message at the point of SMTP connection. This will make the connecting server create an NDR for the sender.

If you configure a mail size rule in message rules the sender will not be advised that the email was not received by the recipient.
NDR's are not sent from your Mail Server (Domain Route) back to the internet if your server rejects the message and Email Security routes it. This is due to policies and the avoidance on being placed on blacklists due to backscatter and NDR spam.

To change the 50mb limit:

  1. visit your USS Dashboard and click ProductsEmail SecurityMessage Rules.
  2. Double-click the Large Files Rule to edit it.
The Rule might be called Maximum Mail Size on your system.
  1. Find the Email Size Condition, and click .
  2. Choose a new limit from the Condition Value dropdown.


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