Windows Mail 'breaking up' messages sent with larger attachments

Posted on 2009-12-23
Last Modified: 2013-11-30

A friend is having some trouble sending larger attachments using Windows Mail.
I am logging in remotely & trying to assist them.

They can send a normal email, without any attachment.
They can send an email with a ~30KB attachment.

But when trying to send an email with a ~2MB attachment the following happens:
It appears that Windows Mail splits the message up into 'parts' (55 in this particular case).
The send/receive box reads 'Sending message 1 to 55 (part 1 of 55)'.
There is only this one single message in the Outbox.

After it reaches about part 15 of 55; it gives a Server Error 451: Too many messages sent within certain time period. Error code:  0x800CCC6A

The 15 parts that did manage to send then end up in the recipients inbox as separate messages & the original attachment is no where to be seen.

I have done some research & found that Norton products are commonly incompatible with Windows Mail. I have tried disabling all their Norton services & testing it then, but with no luck. Before I remove Norton software completely; is there anything else I can troubleshoot or try...?

Thanks in advance for any help or suggestions.

Client Details:
Desktop PC
Windows Vista -  Windows Firewall: Disabled
Windows Mail v6
Norton 360 AV
Internet Provider: Virgin
Email Account:
Question by:Roger Adams
    LVL 40

    Accepted Solution

    In Windows Mail, try the following procedure.

    1. Click Tools - Accounts

    2. In the pop-up window, select the default mail accounts and click on the Properties button.

    3. Under the Advanced tab of the pop-up window for mail account properties, see whether the check box in front of "Break apart message larger than __ kb" has been marked or not. If yes, remove the tick in the said check box.

    4. Click OK for all open pop-up windows and try to send email with attachment again.

    Author Closing Comment

    by:Roger Adams
    Bang on the money, speedily reply!
    Thanks very much!

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