Some batch SMTP (BSMTP) implementations support the use of the VERB command to control the nature of their replies. On the client side the verb_on command tells PMDF to issue a VERB ON command in the BSMTP command sequence; verb_off tells PMDF to issue a VERB OFF command. The verb_never and/or the verb_none keyword tells PMDF not to issue any VERB commands. verb_never is the default, and this default should not be changed.

On the server side, the verb_never keyword causes VERB commands in the BSMTP stream to be accepted but ignored. verb_none can be used to enable processing of VERB commands.

See Section 3.8.2 for details on how these keywords are used on bit_ and anje_ channels.