There’s a small PGP plugin by Tim Nash on GitHub (but it’s not in the official WordPress repository, it needs to be manually copied to wordpress plugin directory). It’s a wrapper using php-pgp library for encryption. The article where I found this link is “Encrypting emails with PGP and WordPress”. This is the only WordPress solution I have found so far.
I was also digging into the subject and I’m trying more generic approach – extending PHPMailer to support PGP encryption. However, this requires some more testing to support email in both text and html format, PGP/MIME, attachments etc. so this is not ready to be published yet.
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