Sewing is the ninth of the
39 Melachot that
are prohibited on
Shabbat. It includes all
forms of sewing and
needlework.
Pasting, taping and stapling paper are also
prohibited. Thus, one may not seal an envelope
nor attach a postage stamp on the Sabbath.
Fastening something with a safety pin, however,
is permitted, since this is only a temporary fastening.
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Most of this information is taken
from the book "SABBATH Day of Eternity"
by Rabbi Aryeh Kaplan, published by NCSY.
In the book itself, there are notes that refer the
reader to detailed footnotes.
I am lucky to have found such a clear, concise manual
with these brief overviews of laws so vast and complex
there are Rabbis that specialize in them.