If you are sending mail to multiple addresses and one is invalid, the entire
message may be undelivered. That said, if you are not logged on to the
server you are sending through, you will get a similar error.

550 Relaying errors:
http://www.insideoe.com/problems/errors.htm#relay550
--
Bruce Hagen
MS MVP - Outlook Express
~IB-CA~

"Enzo" wrote in message
...
Hi all,
I've been getting undeliverable mail messages every so often and was
wondering if the problem is on my end or the recipient's end. The error
only
happens when I send to this certain recipient. The error is as follows:
Reason: Rejection greeting returned by server.
Diagnostic code: smtp;550 Too many invalid recipients
Remote system: dns;xxx.xxx.com
(TCP|206.46.252.48|55273|162.115.227.108|25)
(Too many invalid recipients)
I am currently using Windows ME and OE6. Thanks for any feedback.