Enough or Sufficient

I think they are both correct but I think you would want to add "postage" after either one.

You could also use "adequate".

Hmmm...
E-mail instead...

Either one is correct, in this case. And it's "envelope" not "envelop". "Envelop" is a verb that means to enclose or cover something completely.

As for how to know when to use each one in a sentence, I don't have an easy answer, except that "enough" is probably used more frequently in everyday usage.

Hi guys,
thanks for ur replies.
And thankQ kickycan for ur correction.