envelope [COMPARATOR] [ADDRESS-PART] [MATCH-TYPE] <envelope-part: string-list> <key-list: string-list>
The "envelope" test is true if the specified part of the SMTP (or equivalent) envelope matches the specified key.
If one of the envelope-part strings is (case insensitive) "from", then matching occurs against the FROM address used in the SMTP MAIL command.
If one of the envelope-part strings is (case insensitive) "to", then matching occurs against the TO address used in the SMTP RCPT command that resulted in this message getting delivered to this user. Note that only the most recent TO is available, and only the one relevant to this user.
The envelope-part is a string list and may contain more than one parameter, in which case all of the strings specified in the key-list are matched against all parts given in the envelope-part list.
Like address and header, this test returns true if any combination of the envelope-part and key-list arguments is true.
All tests against envelopes drop source routes.
If the SMTP transaction involved several RCPT commands, only the data from the RCPT command that caused delivery to this user is available in the "to" part of the envelope.
require "envelope";
if envelope :all :is "from" "tim@example.com" {
discard;
}
Core : require "envelope"; statement needed
RFC3028