Provided by: qpsmtpd_0.94-6_all 

NAME
Qpsmtpd::Constants - Constants for plugins to use
CONSTANTS
See README.plugins for hook specific information on applicable constants.
Constants available:
"OK"
Return this only from the queue phase to indicate the mail was queued successfully.
"DENY"
Returning this from a hook causes a 5xx error (hard failure) to be returned to the connecting client.
"DENYSOFT"
Returning this from a hook causes a 4xx error (temporary failure - try again later) to be returned to
the connecting client.
"DECLINED"
Returning this from a hook implies success, but tells qpsmtpd to go on to the next plugin.
"DONE"
Returning this from a hook implies success, but tells qpsmtpd to skip any remaining plugins for this
phase.
perl v5.36.0 2023-08-20 Qpsmtpd::Constants(3pm)