Import upstream v0.16.22, stripped

Upstream commit: 474dd0229cb20cf513036619781ed97bd8073c3f
Enterprise-only files removed or emptied: 63
Enterprise-only snippets removed: 117 in 50 files
Dangling module declarations removed: 5
Cargo edits turning enterprise off: 14
Verification: clean
Enterprise feature gates left for rebuilt features: 19 in 18 files

Produced by tools/fork/strip.py. The full report is in docs/fork/strip-reports/ on main.

tests/resources/smtp/antispam/date.test

@@ -0,0 +1,23 @@
+expect MISSING_DATE
+
+X-Date: Tue, 1 Jul 2003 10:52:37 +0200
+
+Test
+<!-- NEXT TEST -->
+expect INVALID_DATE
+
+Date: blah blah blah
+
+Test
+<!-- NEXT TEST -->
+expect DATE_IN_PAST
+
+Date: Tue, 1 Jul 2003 10:52:37 +0200
+
+Test
+<!-- NEXT TEST -->
+expect DATE_IN_FUTURE
+
+Date: Tue, 1 Jul 2999 10:52:37 +0200
+
+Test