The answer is different for each pop server, but should be clearly spelled out in the documentation.
In general you will need to be sure that your router and firewall are properly configured.
MSN account does not support POP3 or IMAP server. these accounts work with http server.
Yes it is, I use POP3 through sbcglobal from Outlook Express and Linux's Thunderbird.
Mail.comcast.net
In the Incoming mail (POP3, IMAP, or HTTP) server box, type pop3.live.com. In the Outgoing mail (SMTP) server box, type smtp.live.co
Hotmail's incoming mail server for POP3 is pop3.live.com on port 995. Hotmail's incoming mail server for IMAPis imap-mail.live.com on port 993.
pop.yahoo.com smtp.yahoo.com I think
the new incoming server is: pop3.live.com Out going server is: smtp.live.comThe Windows Live POP3 mail server settings are:• pop3.live.com - for the Incoming mail• smtp.live.com - for the Outgoing mail
CAS
Post Office Protocol version 3 (POP3) is a protocol used by email clients to retrieve emails from a mail server. It operates on port 110 and typically downloads emails from the server to the client's device.
POP3 and IMAP4
Verizon just added ssl encryption to it's POP3 servers. They have been phasing it in over the past 6 months (as of January, 2012). Incoming Server: incoming.verizon.net - port 995 Outgoing Server: outgoing.verizon.net - port 465
Hotmail does not support pop3 unless you are a paying subscriber. GMX.com is free mail that does support pop3 and imap.