One of our remote users encounters this from time to time sending to a list
of 20+ recipients. She encounteres the 452 too many recipients. I confirmed
with our ISP aka the SMTP server that there are no limits to recipients only
number of emails per day (i.e. 2,000+)

I have asked that she capture the message header from this "system
administrator" as it is not clear if it's an Outlook thing. I am sure it's
not the ISP. Do any of you use an AV / Internet security product as well ie.
Norton Internet Security?

T

"Dan Noel" wrote:

I suffered from this problem for months; I had trouble blaming the ISP
because the error message in the In Box came from "System Administrator",
whose properties did not include an Email address, because my ISP would not
confirm the problem, and because the problem would not occur if I sent using
the Email address I had in my ISP's domain. My Email would be sent to no
more than 5 recipients at a time.
The only way I found around this problem was to simply resend the Email
(using the edit and resend commands); the new Email would go to the Out Box,
and after typically 20 minutes, would go out again as if by magic, yielding
another error message if the number of recipients was still higher than 5. I
would repeat this process until all the intended recipients would be covered.
Now, to Jocelyn's point, the problem went away when I happened to switch ISP
(to SBC from AOL). I don't know what my recipient count limit is now, but it
seems to be higher than 20.
Hope this helps...
Dan Noel

"Jocelyn Fiorello [MVP - Outlook]" wrote:

Your ISP is setting this limit...you'll have to talk to them about this
issue.

--
Jocelyn Fiorello
MVP - Outlook

*** Messages sent to my e-mail address will NOT be answered -- please reply
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"Gregg L" Gregg wrote in message
...
I have a contact group of 20 members and when I try to send only a portion
are sent. I get a "Undeliverable" error message (452 4.5.3 Too many
recipients. Can anyone tell me how to fix this