Crossword puzzle clue "how letters are sent"

Here are the possible solutions for how letters are sent clue

Answer
Clue
Relevancy
airmail
Clue
Letters sent by plane
Letters and packages sent by plane
Definition
to send mail by airplane
apo
Clue
Where letters are sent to the mil.
Definition
(short for) apolipoprotein, a type of protein
email
Clue
Letters sent via PC
Definition
to send electronic mail
firstclassmail
Clue
How letters are sent
hatemail
Clue
Letters often sent without a return address
sos
Clue
Letters sent by a boat in distress
unmailed
Clue
Like letters not sent

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