I use GMail filters to keep all the emails I get from Yahoo's ad system in one place.

To make a filter in GMail that handles more than one address, you can separate the addresses with a vertical bar - '|', but not a comma.

customersolutions--ysm@cc.yahoo-inc.com | solutions@ysm.yahoo-email.com

Or you can follow GMail's help advice, and put them all in parenthesis, with an OR between addresses.

(customersolutions--ysm@cc.yahoo-inc.com OR solutions@ysm.yahoo-email.com)

The OR technique doesn't seem to work without the parens, while the vertical bar does...

¶ 1/22/2007