A Trouble

I am going to study abroad in Canada this summer. I received acceptance letter from university in Canada. I am able to be accept as visiting student. This mail says please reply e-mail. That's why I tried to reply but I couldn't sent e-mail. My cellphone's display was said that you can't find user and ensure her address. I didn't have no idea why I couldn't send e-mail. I though my cellphone can't send to overseas. So I sent g-mail. I'm sure I could sent. But after 2 days, I received a notice which said that I couldn't find user. I want to reply early. I am very worry. I must receive letter because I will be must take Visa. I hope a problem is solve early.

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