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For some companies, the lowly return envelope is a more important insert than any advertising.

His father had put it in a return envelope and sent it back.

Each letter will include a new registration form and a postage-paid return envelope.

The direct mail industry makes extensive use of return envelopes as a response mechanism.

Use the return envelope provided and don't fold the form.

Just fill out the enclosed pledge card and send it in the return envelope today.

As of yesterday, the embassy had not yet sent back my pre-paid return envelope.

The bill for their first semester's work is enclosed, together with a return envelope.

Please feel free to use the return envelope to mail your pledge card or gift right away.

Fill out the form and mail it back in the postage-paid return envelope.