Here is a list of Swedish Internet Providers Relay Host.

• 3 - smtp.tre.se
• Algonet -  smtp.algonet.se
• Bahnhof Bredband - mail2.bahnhof.se
• BIP -  smtp.bip.net
• Blixtvik - smtp.blixtmail.se
• Bredbandsbolaget - smtp.bredband.net
• Comhem - mail1.comhem.se
• Glocalnet -  smtp.glocalnet.net
• Internet5 - mailhost.internet5.net
• Netatonce - smtp.netatonce.net
• Song - customer-relay.songnetworks.se
• Spray - smtp.spray.se
• TDC - smtp.mytdc.se
• Tele2 - mail.tele2.se
• Telenor - smtp.telenor.se
• Telenor Mobilt Bredband/Vodafone/Europolitan - smtp.euromail.se
• Telenordia - smtp.telenor.se
• Telia - mail1.telia.com, mailout.telia.com (Port 465  och SSL), smtprelay1.telia.com
• UPC/Chello - mail.chello.se

Some information about SMTP

An SMTP server (Simple Mail Transfer Protocol) is the mail server you use to send out e-mail. It is completely independent from the mail server you use to receive mail from (usually a POP3 server).

SMTP protocol enabling the transmission of messages between computers / servers. SMTP is the basic protocol for the handling of messages according to TCP / IP protocol.