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Outbound Mail Failure

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6 replies

by henrysin

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Exchange Server - Outbound Mail Failure
What causes this?

Subject: Notification: Outbound Mail Failure - A protocol error occurred.

A mail message was not sent due to a protocol error.

2431464 bytes exceeds server limit of 1572864

The message that caused this notification was:

To: <123@hotmail.com>
From:
Subject: FW: KF Easter Leaflets

Thanks for your help

6 replies

by dmoloney68

Your server only allows 1.5M Bytes to be sent from its server. In other words the message or attachment is too large. Hope this helps

by henrysin

Actually, l set the server can allows max 5M mail to be sent/receive. How come my server only allows 1.5M mail to be sent/receive. Could you like to tell me how to fix it. Thanks alot.

by cascom

Mail size limitation can be set at either end of the message's travel.
Most likely the receiving server has a limit set which is smaller than the message.
Another scenario is that the mail recipient's mailbox only has 1.5MB of space left.
Limitations are not necessarily implemented by only the sending server.

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