A postmark is an official postal marking applied by the United States Postal Service (USPS) to a mailpiece, such as a letter or package
Depending on whether you're looking for information on the itself or the transactional email service , here are highly-rated articles and guides for both: The USPS Postmark (Mailing Deadlines) postmark
client.sendEmail( "From": "hello@yourdomain.com", "To": "user@example.com", "Subject": "Your order is confirmed", "HtmlBody": "<strong>Order #1234</strong> is on its way!" ); A postmark is an official postal marking applied
So the next time you drop a letter in the mailbox, look at the top right corner. That little smear of ink isn't just killing a stamp; it is sealing a moment in time. Protect it, read it, and appreciate it—before the digital tide washes it away entirely. "Subject": "Your order is confirmed"