What should I do when I arrive at immigration in Bangkok with my DTV visa?

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PRINT OUT THE EMAIL THAT HAS YOUR DTV VISA.

That's what you should do... print it out.

You may have to show PROOF of your DTV Visa to airline staff on check-in for your flight ✈️ to Thailand...even to the connecting airline staff. Or to the land border crossing entry Thai Immigration Officer.

Upon arrival into Thailand, show the DTV visa to the Thai Immigration Officer and look at the STAMP placed in your passport to be sure you are STAMPED in for 180 days.

Check the stamp too before you walk through and make sure they give the appropriate 180 days

Yeah, show them your DTV, they will stamp you in. May ask you some basic questions or nothing at all.