Yes, mails is a Scrabble word!

Verb

1. Send via the postal service

2. Cause to be directed or transmitted to another place

Noun

1. The bags of letters and packages that are transported by the postal service

2. The system whereby messages are transmitted via the post office

3. A conveyance that transports the letters and packages that are conveyed by the postal system

4. Any particular collection of letters or packages that is delivered

5. (Middle Ages) flexible armor made of interlinked metal rings