If your Internet Service Provider blocks port 25 (default SMTP server), you may use this list of alternative SMTP servers. Please substitute the original outgoing e-mail server with the one, specified for the provider you use:

AOL: smtp.mail.aol.com
Adelphia: mail.adelphia.net
Ameritech: mailhost.det.ameritech.net
AT&T: mailhost.att.net
AT&T Global: smtp1.attglobal.net
Bell Internet High Speed (Canada): smtp10.bellnet.ca
Bell south: mail.bellsouth.net
CableOne: mail.cableone.net
Charter Communications: smtp.chartermi.net
Charter.net: smtp.charter.net
CharterTN.net: mail.chartertn.net
CharterMI.net: mail.chartermi.net
Cinncinnati Bell/Fuse Dial-up: smtp.fuse.net
Coax.net: smtp.west.coax.net /east / central
Comcast: smtp.comcast.net
Cox: smtp.west.cox.net; smtp.central.cox.net; smtp.east.cox.net (either of the three depending on your location).
Earthlink: smtp.earthlink.net
Etisalat: smtp.emirates.net.ae
Epix: out.epix.net
Erols: smtp.erols.com
Frontiernet.net: smtp.frontiernet.net
Fuse: smtp.fuse.net
Juno: smtp.juno.com
Mindspring: smtp.mindspring.com
MSN: smtp.email.msn.com
MSN.DSL: secure.smtp.email.msn.com
NEBI.com: mail.nebi.com
Netcom: smtp.ix.netcom.com
NetZero: smtp.netzero.net
OOL (Optimum Online): mail.optonline.net
Pacific Bell (Pacbell): mail.pacbell.net
Panix.com: mailhost.panix.com
PeoplePC: smtp.peoplepc.com
Quixnet.net: smtp.quixnet.net
RCN: smtp.rcn.com
Road Runner (NYC): smtp-server.nyc.rr.com (if outside the NYC area, please call your local Road Runner Support team)
Rogers Hi-Speed: smtp.broadband.rogers.com
SBC: smtp.sbcglobal.net
SBC Yahoo: smtp.sbcglobal.yahoo.com
Speakeasy: mail.speakeasy.net
The-Beach.net: mail.the-beach.net
Verio: smtp.veriomail.com
Verizon: outgoing.verizon.net or smtpout.verizon.net

Please note the list is not exhaustive. If your provider is not listed, or in case the setting listed does not work for you, please refer to the provider's support team and let us know what the correct setting is. Your feedback is most appreciated.