Dear Mr. Stephenson,
Reading your message I found the way to solve problem with sending e-mails from Pegasus.
I had troble using Pegasus from november 2006.
"After installing latest version of Pegasus mail v 4.41 I can not send
e-mails via SMTP server of my Cable ISP. If I use other e-mail
software I can send e-mail via same SMTP server. With other ISP SMTP
servers sending of e-mails working fine."
I used today http://www.speedguide.net/files/TCPOptimizer.exe and start option
in program to find maximum MTU and used this value, I also checked No for MTU discovery.
I can use Pegasus mail for sending messages even if I use connection of my cable provider and all
programs also work fine now.