This is the workhorse of a mailroom and the one to standardise on, because almost all business correspondence is a page or two folded in thirds. The detail worth checking is the window, since a window that does not align with the address block on your letterhead means every envelope needs a label instead. Self-seal saves time on a long run. See envelopes, C5 envelopes and DLX envelopes.

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    DL Envelopes for Mail

    Shop DL envelopes for letters, invoices, statements, notices, invitations, business mail and office use.