I'm afraid that I'm stuck with Windows OS, I toll my boss of Linux option one time and I don't thing I will propose it to him again :P Since I'm stuck with Win OS, they are really no other SMTP out there that could do the job? What would be a good rate for IIS SMTP like how many mail per day could this SMTP take? About the millions email I don't think we never going to send as many per day, I just don't know how many they want to send so I just putted a very high amount to be sure that our system will be performing really good. -----Original Message----- From: LISTSERV site administrators' forum [mailto:[log in to unmask]] On Behalf Of Valdis Kletnieks Sent: Tuesday, April 11, 2006 1:27 PM To: [log in to unmask] Subject: Re: IIS SMTP Issues Anyone? On Tue, 11 Apr 2006 12:54:46 -0300, Bruno Robichaud said: > Hi, I was just wondering if other has the same issues with IIS SMTP, one day > it work, some other day not anymore. Redmond Quality Software. :) I don't know *anybody* who's using IIS SMTP for anything other than toy workloads. If you're stuck with Windows, your best choice is probably LSoft's LSMTP or offload the heavy lifting to another box running some Linux or *BSD with a good MTA such as Sendmail or Postfix or similar. Also, I suspect that many of us here have a totally different definition of "a lot of mailing" than you do. A million a day is "slow", a million an hour is getting up there, and I know people who are doing stuff at the 10M/hour level using Sendmail. (Side note - throwing a million e-mails an hour is fairly easy once you understand your queue management. *Catching* a million e-mails an hour is a lot harder, mostly because getting them into user mailboxes tends to be I/O intensive...)