Hmm Well I telneted to port 25 and tried: RCTP TO: <use...@agni.phys.iit.edu use...@agni.phys.iit.edu> RCTP TO: <use...@agni.phys.iit.edu,use...@agni.phys.iit.edu> RCTP TO: <use...@agni.phys.iit.edu, use...@agni.phys.iit.edu> RCTP TO: <use...@agni.phys.iit.edu;use...@agni.phys.iit.edu> RCTP TO: <use...@agni.phys.iit.edu; use...@agni.phys.iit.edu>

and All gave me a syntax error or unknown user.

I think ONLY one mailbox per RCTP TO statement is allowed ( which seems to be inaccordance with the RFC)

Also it gives the RFC821 non compliance message if anything precedes the <mbox@domain> statement.

Something like RCPT TO: <mbox@domain> "first last" WILL be accepted but I have no idea if the data is registered anywhere.

The other odd thing is that while testing I ended giving it a LOT of bad commands.. and it seems that the replys, positive OR negative got slower and slower... up to several minutes wait between command replys.

This seems odd... I don't remember for sure but Courier does spawn children to handle multiple connections at a time right? And default is what, 10? It occurs to me that if the behavior i'm seeing isn't an aberration, this could lead to DOS... a REALLY bad, or malicious client could send many bad commands and repeatedly connect - jamming up the works indefinitely due to the lengthening reply time.

Any way that aside, the proper way to send to multiple recipients would be: RCTP TO: <user1@domain> RCTP TO: <user2@domain> RCTP TO: <user3@domain> RCTP TO: <user4@domain>

Correct?

Thanks, David. Greg Owen wrote: