for outgoing mail server - smtp - can we use yahoo instead of gmail? if so, how can we setup yahoo smtp on suiteCRM ?
You can use absolutely every SMTP server out there with SuiteCRM. you set it up by including the normal SMTP parameters that Yahoo provides you with.
If you have difficulties, try Googling for answers, but don’t bother mentioning SuiteCRM - all you need is generic Yahoo SMTP configuration help.