Mail::Milter::Wrapper::DecodeSRS(3pm)			User Contributed Perl Documentation		     Mail::Milter::Wrapper::DecodeSRS(3pm)

NAME

       Mail::Milter::Wrapper::DecodeSRS - milter wrapper to decode SRS-encoded return path

SYNOPSIS

	   use Mail::Milter::Wrapper::DecodeSRS;

	   my $milter = ...;
	   my $wrapper = new Mail::Milter::Wrapper::DecodeSRS($milter);

	   my $wrapper2 = &DecodeSRS($milter); # convenience

DESCRIPTION

       Mail::Milter::Wrapper::DecodeSRS is a convenience milter wrapper which decodes MAIL FROM: return paths which have been encoded by the
       Sender Rewrite Scheme, SRS.  (More information:	http://www.libsrs2.org/) This wrapper internally understands both the SRS0 and SRS1 encod-
       ing schemes documented by the Mail::SRS author.

       The decoded address is made available to the contained milter via the "envfrom" callback, in the same way that a raw address would.

       NOTE:  If the address is not SRS encoded, the contained milter is NOT called for the duration of the message; instead, SMFIS_ACCEPT is
       returned.  This is because the milter writer is expected to use this wrapper in a chain that also includes the contained milter without
       wrapping, in order to prevent a malicious sender from using SRS to bypass access checks.

       For instance, the following is a proper usage of this wrapper in a chain:

	   my $envfrommilter = ...;

	   my $combinedmilter = new Mail::Milter::Chain(
	       new Mail::Milter::Wrapper::UnwrapSRS($envfrommilter),
	       $envfrommilter
	   );

       This behavior can also be used if, e.g., the MTA already does one form of MAIL FROM: check, and the contained milter repeats that same
       database check against SRS rewritten addresses.	(A good example would be a milter emulating Sendmail's access_db map.)

AUTHOR

       Todd Vierling, <tv@duh.org> <tv@pobox.com>

SEE ALSO

       Mail::Milter::Wrapper

perl v5.8.8							    2004-02-26				     Mail::Milter::Wrapper::DecodeSRS(3pm)