Add Proxy Support

[CodeMouse92 (Jason C. McDonald)]

Mailspring’s sync engine doesn’t currently pick up system proxy settings, especially on Windows and Linux, but it should. This makes it unusable when used behind a proxy, including with Tor (Socks5) and behind Corporate proxies.

[Feature request] Proxy Support

Duplicate Issues

SMTP error when OpenVPN [Proxy] is connected · Issue #352 · Foundry376/Mailspring · GitHub

Problems running the snap package on openSUSE TW · Issue #459 · Foundry376/Mailspring · GitHub

How to set the Imap, Pop3 or Smtp via HTTP or SOCKS proxy? · Issue #543 · Foundry376/Mailspring · GitHub

Feature Request: Need proxy function · Issue #1820 · Foundry376/Mailspring · GitHub