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The goal is to allow users to log in to the local mail server so they can send emails. Users will use teh same username and password as the one they will be using for checking email.The goal is to allow users to log in to the local mail server so they can send emails. Users will use the same username and password as the one they will be using for checking email. POP3 and IMAP users that have already logged in to check email will be authenticated.=== Who needs SASL ===If all of your email users are on the same network, within the same gateway as your mail server, then you can simply allow relaying of mail based on your subnet and SASL is not necessary. If you have users outside of your network that connect from a variety of networks, some users having dynamic IP addresses, and perhaps users on an ISP that doesn't offer an open port 25 relay, then SASL is a good solution for you. SASL is able to provide a mechanism to authenticate remote users by username and password who wish to send mail through the mail server.