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However, the world of the postmark is shifting. As of late 2025, the U.S. Postal Service updated its rules: a postmark now reflects the date an item is first processed by an automated machine, not necessarily the day it was dropped in a blue collection box. This change has turned the quest for a same-day postmark into a race against the clock, requiring a trip to the retail counter to ensure a manual "hand-cancel". postmark
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: For larger setups, verify an entire domain to send from any address on that domain without per-address confirmation. Organise with Servers This change has turned the quest for a