[IMail Forum] SMTP Problem

[stueckmann]

Using Windows NT 4, IIS 4, Service Pack 5, IMail 5.05 we are experiencing the following problem:   Sending mails is only possible with all ports opened. If the security filters are activated and some ports are closed, no mails can be send - they are all queued.   We have opened all standard ports under TCP and UDP; IP ports are all opened. Opened are: 21, 25, 42, 53, 80, 99, 106, 110, 135, 139, 143, 161, 162, 389 and approx. 20 "free" ports, which we have taken from the syslogs generated by IMail.   Name Server and security options appear to be correct.   Upon restarting the server we receive the message: "server started on port 106 and 25", and the server tries to connect via several other ports to send the mails. Somentimes he choses one of the opened ports, but at the same time the tries those ports which are not opened. The result is that - if we are lucky - he succeeds in sending one mail - the rest stays queued.   Does anybody know whether there are other standard ports necessary for the IMail server???   Thanks in advance, Ina