Re: Support for RFC 1893 - Enhanced Mail System Status Codes

[John Peacock]

Matt Sergeant wrote:
If we start adding all this stuff to Plugin.pm it has the possibility of 
getting very bloated - there's so much we could just add in there for 
convenience. I kind of saw the DSN stuff as a helper class, something 
not required but useful, hence the externalisation.

The counter argument being that we *should* be returning the DSN codes 
and making it easier for plugin authors to DTRT is a side benefit of 
that larger goal.

How about we split change Qpsmtpd::DSN so that any one plugin must load 
it, but the methods are added to the Qpsmtpd::Plugin class, rather than 
the Qpsmtpd::DSN class?  That way, the lean mean spam-eating machine 
doesn't need to load it ever, but the ordinary slow and steady MTA gets 
the methods in easy to call ways.  A true helper class.

John