send something by mail AmE
send by mail AmE
send something by post BrE
send by post BrE

Having tickets sent by registered mail is an extra $7.

However, staff will send them to you by postal mail upon request.

But suppose the company wants to send a letter to the association by electronic mail.

The high number may be because students are not to send the cards by mail.

Washington also sent a letter by registered mail to their place of business in Missouri.

I will send you by today's mail, several numbers of her diary, also a story which she wrote in Braille after having read it once.

But a guard instructed them to send it by express mail.

Customers may either bring instruments directly into the store or send them by mail.

She sent in all her information on Jan. 11, 2006, by certified mail.

Users can record voice messages and send them to one another by electronic mail.