ZF-9821: _formatAddress only quotes names containing '@' or ','

Description

I receive the following error when sending to a particular mail exchange

bq. 5.1.0 - Unknown address error 550-'Rejected after DATA: missing or malformed local part (expected word or\n"<"): failing address in "To" header is:\nDave Marshall [Director] email@example.com

From what I can see here http://tools.ietf.org/html/rfc5322#page-13, the following characters should force the name part to be quoted:

"(", ")", "<", ">", "[", "]", ":", ";", "@", "\", ",", "."

Feel free to reject this if I've misinterpreted the RFC!

Comments

Patch and simple test

Sorry, I have been inactive since last April.

This patch seems to work well. Does someone want to commit this?

Fixed.