ISMail Pro Standards

ISMail Pro supports the following RFCs:

SMTP:

• RFC 1869 (ESMTP)
• RFC 1870 (Message size)
• RFC 1985 (ETRN)
• RFC 2222 (SASL)
• RFC 2554 (SMTP Authentication)
• RFC 2821 (SMTP)

POP3:

• RFC 1081 (POP3)
• RFC 1939 (POP3 revised)

IMAP4:

• RFC 2088 (Non-synchronizing literals)
• RFC 2177 (IDLE)
• RFC 2342 (Namespace)
• RFC 3501 (IMAP4rev1)
• RFC 3691 (UNSELECT)