Athena T wrote:

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+)

They may not be telling you the truth. The "452" error is a server-side
error. It is some mail server reporting back to Outlook. Outlook is NOT
generating the message. Now, it may not be your mail server doing the
reporting (i.e., your ISP is telling you the truth), but it may be your
recipients' mail server if you're sending to multiple people in the same
domain. However, I find that less likely than it being on your mail server.

I have asked that she capture the message header from this "system
administrator" as it is not clear if it's an Outlook thing.

It's not. It's a server-generated error.

I am sure it's not the ISP.

I'm not. Despite what they told you, it could still be they.

Do any of you use an AV / Internet security
product as well ie. Norton Internet Security?

Plenty do, but not I. Symantec products don't seem to get along well with
Outlook.
--
Brian Tillman