Crossword puzzle clue "a kind of mail"

Here are the possible solutions for a kind of mail clue

Answer
Clue
Relevancy
errs
Clue
Forgets to mail the mail, say
Definition
ERR, to make a mistake
pss
Clue
They come after signatures in snail mail, yet before signatures in e-mail: Abbr.
sent
Clue
___ mail (e-mail folder)
snail
Clue
___ mail (e-mail alternative)
speedier
Clue
Like express mail vis-à-vis regular mail
air
Clue
Kind of mail
Definition
the mixture of gases breathed by people and animals, also AYRE
airpost
Clue
A kind of mail.
Definition
the system of conveying mail by air
bulk
Clue
Kind of mail
Definition
to gather into a mass

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