MTN email2SMS service

[ObeyTheDiode]

MTN subscribers get 5 free SMS to other MTN subscribers per day - sent via the MTN website or <the_subscribers_number>@sms.co.za.

I'm registered on the site and have successfully sent many SMS's via the web interface. The email method, on the other hand, always fails. I get the following response from server:

We couldn’t deliver your email2SMS message because we don’t know your email address. To send email messages as an SMS you must be a registered member on the MTN web site and you must supply us with the email ddress you will be sending the messages from. To register on the MTN web site please go to http://www.mtn.co.za/register. If you are already registered then please supply your email address at http://www.mtn.co.za/details.

I've checked my details -they're correct (I always get my MTN bill - obviously).

I've tried sending email using several accounts (updating details every time - with sufficient time to update i.e 1-2 days).I used local university, Yahoo! and MTN own email service. All of them tried using all SMTP available (MTN, mWeb ) to me and different email clients (TB, Web and phone (s60)).

I always get the same response.

Any ideas from people who got this working?