[BUG] I can't set proxy for email account (IMAP)

[cibimo]

Version

1.6.2

Steps to Reproduce

Add a proxy and then add an email account

Issue Description

I can't find where to set it, but I found it exists in the API. Is it not displayed on the frontend? (Oauth2 is able to set proxy)

Screenshots or Logs (optional)

In our country, we have to connect to certain servers through a proxy

[cibimo]

I added the use_proxy parameter to the request body using fetch, and it worked normally. I guess it was because the frontend form was missing it

[rustmailer]

I missed the proxy when switching from dialog to page last time.