clearaddress / bulk Try it
Bulk verification

Check a whole list.

Paste your addresses and get the same five checks for each one, with a summary, filters and a CSV to take back to your list. Want one address only? Use the single check.

0 addresses · 0 domains

One per line, or separated by commas, semicolons or spaces. Up to 500 addresses and 50 distinct domains per request; longer lists are split into batches automatically.

Same check, via API 
$ curl -fsSL -X POST "https://ca.rda.run/v1/bulk" -H "Content-Type: application/json" -d '["john.doe@example.org","admin@example.org"]'

Details in the API reference.