Release from Control Center quarantine to external domain which requires TLS

So, we have a case of an outgoing email that got quarantined (thanks for those new methods of detecting executables within attachments, Symantec!).

And when we try to release that [totally legitimate] email from the quarantine, the release fails.   It turns out the recipient's email system will only accept emails with TLS.

But the Control Center's SMTP engine doesn't support TLS ?

Awesome.

https://support.symantec.com/us/en/article.tech254102.html