bulk mail

noun
a category of mail for mailing large numbers of identical printed items to individual addressees at less than first-class rates, as circulars or bulletins.
Dictionary.com Unabridged

bulk-mail

[buhlk-meyl]
verb (used with object)
to mail as bulk mail.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To bulk mail
Example sentences
Distributed to residents by bulk mail or in utility bills.
Using precanceled stamps on your mail is an easy way to get started with bulk
  mail.
If you did not receive a confirmation e-mail, check your spam or bulk mail
  in-box.
Permit imprints must not denote bulk mail, nonprofit, or other domestic or
  special mail markings.
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