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Got a call with an older site – All email address’ now have [[email protected]](mailto:[email protected])as well as every email in the site posts (like contact and other) also have this rewrite…
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Anyone seen before and know a quick fix for it?
Generally seems to be done after 6.2 update but there were plugins updated as well
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Not only are the posts re-written but the user accounts email address’ were also rewritten to include the subdomain (www) in this case.

Quick fix by restore or test on another domain with the older backup and try replicate the issue, which update cause it rather than based on assumption.
And do a security scan for malware too. I have seen some malware littering random folders all over the directories is a terrible experience for WordPress site.
Roll back to a backup. Let me guess, they don’t backup lol
Search and replace @www. to @ using Better Search Replace or WP migrate (back up the db first)
Haven’t heard of this before but if it’s changed in the DB that would be a quick way to fix that.