[MlMt] Image proxy

[Alexandru Nedelcu]

Hello,

One thing I miss in Mailmate vs webmail is the ability to show images 
without leaking my IP or other identifying info — something that 
GMail or FastMail are able to do when using their clients.

Would have been great if Mailmate supported a proxy that isn't system 
wide — ensuring that it is always on, because I don't want all traffic 
to be proxied, just my email. I was also thinking of creating a Bundle 
that replaces images with proxied URLs in HTMLs, not sure if possible.

Does anything exist that I could reuse?

Thanks,

-- 
Alexandru Nedelcu
https://alexn.org