SMTP Authentication

ISMail requires a mail client program to authenticate before sending messages in order to prevent unauthorized use of the mail server. SMTP Authentication enables a mail client to authenticate with a valid user account just before a message is sent, rather than using a Trusted IP address, or logging in to a POP3 or IMAP4 account.

ISMail supports SMTP Authentication using SASL and several authentication protocols. The mail client must also be configured to use SMTP Authentication. 

Supported SMTP Authentication protocols:

• PLAIN: simplest authentication (unencrypted)
• LOGIN: simple, common authentication (unencrypted)
• NTLM: non-standard authentication
• CRAM-MD5: standard authentication (encrypted)

Default SMTP authentications:

• CRAM-MD5: Enabled (encrypted authentication)
• LOGIN: Enabled (unencrypted authentication)