This is one of the ways of expressing this sentence in Panjabi.

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Note added at 2003-11-09 06:15:39 (GMT)
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Please note that the literal translation of this expression would look like:

Mannu khushee ve ke tuhanu ae changee laggi hai.

But I have added e-mail in the sentence in order to clarify to your friend as to what you intend to communicate. I would also like to apprise you of certain words:

I = Mannu
glad = Khushee
you = tuhanu
liked = changee laggi

Here is another way to translate this sentence:

Maein khush haan ke tuhanu meree e-mail pasand aayee.

Hope this helps.