Dream Symbols in The Dream Encyclopedia
by James R. Lewis and Evelyn Dorothy Oliver
Envelopes usually signify anticipation or opportunity within a dream.
If envelopes remain unopened, it may indicate that the dreamer has missed an opportunity.
If the dreamer is eagerly anticipating an envelope’s contents, it may mean that the dreamer will experience a wonderful outcome of an event in waking life.
Mystic Dream Book
by Internet Archive - Anonymous
Closed Envelopes represent difficulties.
If you can open the Envelope and remove the contents, then some worry will be smoothed away.
