Often we get asked about Mail Server addresses / names. We found a list of SMTP-servers (outgoing server's) for some common ISP's:

@home - mail.home.com
adelphia.net - smtp.adelphia.net
AltaVista.com - email.1stup.com 
AT&T - smtp1.attglobal.net
bellatlantic.net - smtpout.bellatlantic.net
erols.com - smtp.erols.com
earthlink - mail.earthlink.net
ibm.net - smtp1.ibm.net
netcom.com - smtp.ix.netcom.com
netreach.net - smtp.netreach.net
netzero.net - smtp.netzero.net
rcn.com - smtp.rcn.com
uu.net - alterdial.uu.net
wcom.net - pop3host.wanmail.net

For the incomming mailserver just replace SMTP with POP3 or MAIL.