(Versión en castellano)
Walter Alejandro Iglesias <wairoquesor.com>
Problem: when trying to send a message to my address above (or to my wife's,) you get an error saying something like the connection with my server could not be (successfully) established.
Reason: the mail server you're using is being used by spammers, so its IP (physical address) ended up on one of my blacklists and blocked by my firewall.
Solution: try using another server (even better if you avoid using yahoo, hotmail or gmail.)
If you still receive an error while using an alternate server, then probably there is another reason. But, keep in mind that big is the chance.