MailTones works great - I've been using it for over a year. But there is one downside - security. In order for it to work, you have to set it up to auto-forward your email to MailTones' servers. There they receive the email, trigger the alert and send the email back to you.
Originally Posted by mr_cuervo
In my case, it's not an issue because I use it for my pager at work - and the message just contains a problem ticket number, an 8 digit number that means nothing to the average person. When I get the alert, I log into the problem system at work and access the ticket number that I was sent.
But if your emails contain any kind of sensitive information, it may not be a wise choice. I have never had an issue with anything being shared by them, but you never know. And again, in my case, all they have is an 8-digit number with no context.