average
our mail averages 20 letters a day

certify
certified mail

coat
coat of mail

electronic
electronic mail

email
e-mail

express
express mail

fan
leque

first-class
first-class mail / first-class post

hate
hate mail

junk
junk mail

keypal
correspondente por e-mail

mail
to send something by mail

MIME
Multipurpose Internet Mail Extensions

return
...return of mail / by return of post

RM
Royal Mail

RMS
Royal Mail Service

sail in
...stack of mail

sail into
...stack of mail

shirt
shirt of mail

SMTP
Simple Mail Transfer Protocol

snail
snail mail

surface
surface mail

voice
voice mail