Wednesday, January 22, 2014


The SMTP BDAT command is an alternative to the DATA command, which can be used when a remote SMTP server presents the CHUNKING verb. CHUNKING is an ESMTP functionality. Microsoft Exchange servers implement this feature by default, as do other SMTP servers.

If BDAT is used to transfer emails between two SMTP servers for which the FortiGate unit is performing antivirus session scanning, delivery problems and/or performance problems may occur caused by retransmission attempts.

The problem occurs when multiple email messages are transfered within the same TCP session using multiple BDAT commands. The transfer of a single email per session, with the use of only one BDAT command does not pose a problem.

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