"mailing" in the noun sense
1. mailing
mail sent by a sender at one time
"the candidate sent out three large mailings"
2. mailing, posting
the transmission of a letter
"the postmark indicates the time of mailing"
"mailing" in the verb sense
1. mail, get off
send via the postal service
"I'll mail you the check tomorrow"
2. mail, post, send
cause to be directed or transmitted to another place
"send me your latest results"
"I'll mail you the paper when it's written"
Source: WordNet® (An amazing lexical database of English)
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