I can receive mail but can not send mail
Connections to the server “smtp.frontiernet.net” on the default ports failed (error 54: Connection reset by peer)
Select a different outgoing mail server from the list below or click Try Later to leave the message in your Outbox until it can be delivered.
Also in accounts it states the that smtp server is offline.
iMac4,1, Mac OS X (10.5.6), Intel Core Duo, 1.83 GHz