This is already implemented in HEAD with the max_recipients permission 
(and further, the max_timelimit perm which allows a max # of 
recipients over a configurable # of hours instead of just per-message).

This issue has been raised on the mailing list but it never got added 
as a Feature Request, which i think would be very useful.



For a bit of background:

http://groups.google.com/group/mailing.www.horde-imp/browse_frm/thread/1286556366c04074/4b72818a2a78031d?lnk=gst&q=limit+recipients&rnum=1#4b72818a2a78031d



Jon Lewis, who wrote that email with a mention about the necessity for 
this Feature, and like he said he added the functionality to his 
codebase, but i think it would great to have it as an integrated 
feature.



I'm having similar problems even with legitimate users, not just 
massive spammers, but users abusing the "openness" of the use of 
sendmail-thru-qmail-local send, what i mean is we could impose those 
limits on the smtp (which we have) and make IMP send thru smtp, but 
then we lose the benefit of local sending, and also i think it's 
better to receive an error message directly from IMP's interface 
telling the user about the limit of the recipients area.



I personally think this feature would be very well received, any 
toughts about it?



Ismael Sanchez