Problem Description:
After about a max of 70-80 inbound connections(sometimes less, sometimes more) to imail.stic.net from filter.stic.net. no more connections are allowed, not even using telnet to port 25 (see below). After speaking with IPSwitch Tech support, we discussed the setting in Imail for the number of SMTP processes. According to previous discussions with IPswitch Tech support, this setting has nothing to do with the inbound number of SMTP connections, but with the number of processes, processing mail already received. Which is it?
IMail has 1 SMTPD32.exe process that receives E-mail and stores it on the hard drive, and many SMTP32.exe (no "D" in it) processes that come and go to deliver E-mail. The MaxQueProc setting determines the maximum number of SMTP32.exe processes that can run at the same time. Changing the MaxQueProc setting should have no effect on the number of inbound SMTP connections that can be handled.
... we have been told that there is "no hardcoded limit" to the number of connections, and it's strictly related to physical resources on the machine.
I believe that is the case (for receiving E-mail via SMTP).
I also believe that only Ipswitch could comment as to what resource you are running out of that is causing the maximum number of inbound connections.
-Scott
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