Pegasus mail is a very flexible program, hence this description will only handle a certain (common) case. This assumes that you are using the 32 bit Pegasus software, which has been installed on a TCP/IP network, and you are using the WinSock built into Pegasus, rather than going through a User-Defined Gateway (UDG).
For Receiving Mail
POP3 host - Enter the IP address of the VPOP3 server (or 127.0.0.1 if you are not on a LAN).
User name - Enter the Username defined in VPOP3 for the mailbox you want to access.
Password - Enter the Password defined in VPOP3 for the mailbox you want to access.
For Sending Mail
SMTP host - Type the IP address of the VPOP3 server (the same as the POP3 host defined above)
TCP/IP Timeout value - Leave at 30
Outgoing (SMTP) mail
From Field - Enter your email address
Use this From Field to form the SMTP envelope - Enable this
Send Mail at Once without placing in queue - Enable this
Use in Preference to LAN mailer for Internet mail - Enable this
Use for all Outgoing mail, regardless of address - Usually you will disable this, but in certain circumstances you will want to enable this
Incoming (POP3) mail
Connect to POP3 on TCP port Leave at 110
Delete mail from host once successfully retrieved Enable this (this only deletes mail from VPOP3, NOT your ISP - whether that is deleted depends upon your VPOP3 configuration).
Check for new POP3 mail every x secs idle Set this to a value if you want Pegasus to periodically check for new mail at VPOP3
Any fields not mentioned can be set as you see fit.