Name: rfc3028_strict
Type: SWITCH
Default-Value: 1
Last-Modified: 2.3.17

If enabled, Sieve will be strict (per :rfc:`3028`) with regards to which
headers are allowed to be used in address and envelope tests.  This means
that only those headers which are defined to contain addresses will be
allowed in address tests and only "to" and "from" will be allowed in
envelope tests.  When disabled, ANY grammatically correct header will be
allowed.
