At 14:21 09/08/2004 Wednesday, Tabariasl, Hamid wrote:
 >Does anyone know what the above error message is pointing to?

Sounds like an anti-spam technique from subscribers' site

[log in to unmask]" target="_blank">http:[log in to unmask]

http://www.google.com/search?q=%22552%205.5.3%20Too%20many%20recipients%22

see also

ftp://ftp.isi.edu/in-notes/rfc1893.txt

and scroll to x.5.3