E-Mail address with comma in recipient name

Summary

Steps to reproduce

1. Create a user with "," in there name
2. Try to send a email to that user, for example with "Password reset"

The E-Mail to header will split at each comma. The email is submitted to the user but also many other addresses.

Correct behaviour

Send an email to the user with correct recipient.

Environment

Ubuntu 20.04 with postfix and a relay for email transmission.

Proposed fix

I will create a merge request