https://hunter.io/bulks/email-verifier
Bulk Email Verifier: Verify a list of email addresses • Hunter
Hunter’s Bulk Email Verifier lets you upload a list of email addresses and check their validity in minutes. Start sending your emails to verified email...
bulk email verifierlist of addressesverifyhunter
https://pr0.uk/linux/bash/script/spam/mailserver/procmail/2016/11/27/filter-a-list-of-addresses-with-procmail.html
Filter with procmail using a list of addresses from a file
list of addresses