bulk mail mail consisting of large numbers of identical items (circulars or advertisements) sent to individual addresses at less than 1st-class rates and paid for in one lot
special delivery mail that is delivered by a special carrier (for an additional charge)
mail -
the system whereby messages are transmitted via the post office; "the mail handles billions of items every day"; "he works for the United States mail service"; "in England they call mail `the post'"
snail mail any mail that is physically delivered by the postal service; "email is much faster than snail mail"
mail -
any particular collection of letters or packages that is delivered; "your mail is on the table"; "is there any post for me?"; "she was opening her post"
mail -
To send a letter or parcel through the mail.
Wikipedia
Mail, or post, is a method for transmitting information and tangible objects, wherein written documents, typically enclosed in envelopes and also small packages are delivered to destinations around the world. Anything sent through the postal system is called mail or post. In principle, a postal service can be private or public.
OmegaWiki Dictionary
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mail A batch of letters and parcels received via post.