Re: Why do so few mail providers support Port 587?

Chris Horry wrote:

Yes, right up until a) ISPs wise up and start blocking port 587, and then 465 for good measure. or b) malware authors wise up. B will happen sooner.

I completely agree, which is why if alternative SMTP injection ports are being used, some measure of authentication be used to authorize (or, in case of abuse, block) access. It isn't the magic bullet, and won't work forever, but in regards to the mail systems I maintain, it will do for now. -- Stephen Fulton.