Paul Howarth wrote:The traveling third party is, by definition, a roaming user. Not *your* roaming user, but a roaming user nonetheless. It's up to that user's organization to provide them with usable email connectivity.
Not really. It's up to the ISP to provide connecting user with usable email connectivity. User's original organization / company / network / whatever that provides SMTP AUTH is an nice and usable extra feature, not a requirement.
It's getting more desirable as time goes by. Firstly because of widespread blocking of regions/ISPs, and secondly because of sender-authentication schemes like SPF that work best with an SMTP AUTH arrangement.
Paul.
