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“””They are postage prepaid, and you can hand write the date in yourself according to the rules. No postmark needed.”””

You make a good point that needs to be highlighted. Here is what copilot says when asked this question: “Does USPS Date Stamp a Postage-Paid Envelope?”

“””Copilot Search Branding
USPS does not automatically date stamp a postage-paid envelope just because it has prepaid postage. Whether a date appears depends on the type of postage used and how the mail is processed.

Standard prepaid postage (precanceled stamps, meters, permit imprints)

USPS will not apply a postmark with a date to mail that uses precanceled stamps, metered postage, or permit imprints sjgov.org.

These methods are designed to prevent reuse of postage, so USPS does not cancel or date-stamp them.

The “Postage Paid” marking on the envelope only shows that the sender has prepaid; it does not indicate a USPS-issued date PostGrid.

When USPS applies a date

USPS will date stamp mail that uses standard postage stamps purchased from a retail counter, if the mail is processed at a facility that applies postmarks sjgov.org.

The date on the postmark reflects when the mail was first accepted into USPS custody, not necessarily when it was dropped off Current Federal Tax Developments.

To ensure the date matches the mailing date, you can request a manual (local) postmark at a retail counter or use a Postage Validation Imprint (PVI) when paying at the counter Current Federal Tax Developments.
Key takeaway
If your postage-paid envelope uses precanceled stamps, meters, or permit imprints, it will not have a USPS date stamp. If it uses standard retail stamps and is processed with postmarks, you may see a date, but it may not match the day you mailed it unless you request a manual postmark or PVI Current Federal Tax Developments+1.