EXPN Support

Keywords: expnallow, expndisable, expndefault

expnallow allows EXPN even if it has been disabled at the SMTP server level with the DISABLE_EXPAND SMTP channel option. expndisable disables EXPN unconditionally. expndefault allows EXPN if the SMTP server is set to allow it (default). Expansion can be disabled on a per-list basis, but if it is disabled at the server level, the per-list settings are irrelevant.