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/subject.test

@@ -0,0 +1,138 @@
+expect SUBJ_ALL_CAPS
+
+Subject: HELLO WORLD
+
+Test
+<!-- NEXT TEST -->
+expect LONG_SUBJ
+
+Subject: this is an extremely long subject line that 
+    should be truncated to 80 characters and folded
+    in order to be RFC compliant and avoid the SPAM filter
+    that is looking for long subject lines like this one
+    which by the way, it is ridiculously long 
+
+Test
+<!-- NEXT TEST -->
+expect SUBJECT_NEEDS_ENCODING
+
+Subject: thís líné shóúld bé éncódéd
+
+Test
+<!-- NEXT TEST -->
+param.smtputf8 1
+expect 
+
+Subject: thís líné shóúld bé éncódéd
+
+Test
+<!-- NEXT TEST -->
+param.8bitmime 1
+expect 
+
+Subject: thís líné shóúld bé éncódéd
+
+Test
+<!-- NEXT TEST -->
+expect 
+
+Subject: =?iso-8859-1?Q?Die_Hasen_und_die_Fr=F6sche?=
+
+Test
+<!-- NEXT TEST -->
+expect URL_IN_SUBJECT
+
+Subject: check out my url HTTPS://SPAMMER.COM
+
+Test
+<!-- NEXT TEST -->
+expect URL_IN_SUBJECT
+
+Subject: check out my url HTTP://SPAMMER.COM
+
+Test
+<!-- NEXT TEST -->
+expect MISSING_SUBJECT
+
+X-Subject: missing subject
+
+Test
+<!-- NEXT TEST -->
+expect EMPTY_SUBJECT
+
+Subject: 
+
+Test
+<!-- NEXT TEST -->
+expect SUBJ_EXCESS_QP
+
+Subject: =?iso-8859-1?Q?Die_Hasen_und_die_Froesche?=
+
+Test
+<!-- NEXT TEST -->
+expect SUBJ_EXCESS_BASE64
+
+Subject: =?iso-8859-1?B?RGllIEhhc2VuIHVuIGRpZSBGcm9lc2NoZQ==?=
+
+Test
+<!-- NEXT TEST -->
+expect FAKE_REPLY
+
+Subject: Re: about your question
+
+Test
+<!-- NEXT TEST -->
+expect 
+
+In-Reply-To: <id@domain>
+Subject: Re: about your question
+
+Test
+<!-- NEXT TEST -->
+expect 
+
+References: <id@domain>
+Subject: Re: about your question
+
+Test
+<!-- NEXT TEST -->
+expect SUBJECT_ENDS_SPACES
+
+Subject: =?iso-8859-1?Q?Die_Hasen_und_die_Fr=F6sche_?=
+
+Test
+<!-- NEXT TEST -->
+param.smtputf8 1
+expect SUBJECT_HAS_CURRENCY SUBJECT_ENDS_EXCLAIM
+
+Subject: You have won £200!
+
+Test
+<!-- NEXT TEST -->
+param.smtputf8 1
+expect SUBJECT_HAS_CURRENCY SUBJECT_ENDS_QUESTION
+
+Subject: Have you won $200?
+
+Test
+<!-- NEXT TEST -->
+expect RCPT_IN_SUBJECT
+
+To: [email protected]
+Subject: Great offers for [email protected]
+
+Test
+<!-- NEXT TEST -->
+expect RCPT_DOMAIN_IN_SUBJECT
+
+To: [email protected]
+Subject: Great offers for world.org
+
+Test
+<!-- NEXT TEST -->
+expect 
+
+To: [email protected]
+Subject: Question about [email protected]
+
+Test