The addresses in a to field, lower-cased. a@x.test, Name <b@y.test> gives two. Refuses anything that isn't a plain address, so the cap and the allowlist see every recipient.
to
a@x.test, Name <b@y.test>
The addresses in a
tofield, lower-cased.a@x.test, Name <b@y.test>gives two. Refuses anything that isn't a plain address, so the cap and the allowlist see every recipient.