SMTP Authentication

For secure data communication, SMTP Authentication lets you verify each user who attempts to send mail through your mail server, as long as SMTP Authentication is enabled on the IMail Server. Users need to set their mail clients to do an SMTP login; for example, in Microsoft Outlook on the Tools >Accounts > Mail > Properties > Servers tab select the option My outgoing mail server requires authentication.

SMTP Authentication is used in the following cases:

• If you use the No mail relay option for SMTP relay.
• If you use the Relay mail for (Addresses) option, SMTP Authentication enables users who send from IP addresses that you do not list; for example, users who are travelling and do not have a static IP address.