OT: Best way to send e-mails to a recipient that does know encryption

[john doe]

Hi,

I need to send personal infos to a recipient who has no idea what
encryption is nor is able to decrypt  an encrypted e-mail.

I do not want to use Gmail to send that kind of informations and I'm
comtemplating using posteo.de.

Is this any better?

In other words, how do you use  e-mails with a recipient that should be
able to open and reply to e-mails as usual.

Sorry for being OT.

--
John Doe