Hacker News Reader

Yes, if you spend time in SMTP land you will see lots of domains with multiple TXT records for things like SPF and DKIM. Also, services like Barracuda, Gsuite, O365, etc that use a TXT record to verify you control the domain. Let's Encrypt uses that mechanism as well.

View on HN

The dns_cloudflare [1] also automates the cert generation and follow on renewals on a cron or via nginx proxy manager. Uses cloudflare API key, modifies the TXT record, issues/updates a cert and deletes the record.

[1] https://certbot-dns-cloudflare.readthedocs.io/en/stable/

Matrix federation also uses some txt records (as well as srv) to point other servers go your matrix instance domain

Reply on news.ycombinator.com