We just installed ISA Server 2004 recently. Everything is working fine except when we are sending out emails. Before the server install, we could send out emails from Eudora or Outlook in 2 seconds. But now, it takes 30-40 seconds to send out emails. It shouldn't take that long, should it? A couple of things that I have tried: 1.) I moved the SMTP rule to number 1. This is the first rule in the firewall policies. 2.) I unchecked the SMTP filtering check box.
Is there anything else I can try to speed this up. I will appreciate any help in advance! It sucks if it takes that long to send out emails.
I am running ISA server 2004 on Windows Server 2003. Each email client is connecting to an external email server. The rule that I have in place is to allow all users to use the following selected protocols: IMAP4, IMAP5, SMTP, POP3, NNTP, LDAP, from Internal, Localhost to External.
The network configuration is an edge firewall. The clients are running Windows 2000 Professional. I tried a few other things. I turned off all logging just to see if it made a difference. It still takes long to send out emails.