SMTP AUTH: Client Authentication and Verification

• Configuring Outlook Express to Authenticate to a Remote Mail Server (Morris Inouye)
• Configuring Mozilla's E-mail Client to Authenticate to a Remote Mail Server (Morris Inouye)
• Configuring Pine to Authenticate to a Remote Mail Server (Morris Inouye)
• Negotiating an SMTP AUTH Authentication Mechanism (Weldon Whipple)
• Section of the sendmail/cf/README on SMTP AUTH

RFCs

• RFC 2554 (SMTP AUTH)
• RFC 2222 (SASL)