Delta Chat exposes hostname to SMTP server

[link2xt]

Reported on the forum: https://support.delta.chat/t/delta-chat-disroot-expose-ip-and-machine-name-on-headers/1081

async-smtp issue: chatmail/async-smtp#25

[dignifiedquire]

I am not clear that exposing the public ip is a bug. Seems the smtp server will know this anyway

[link2xt]

Not an IP, but a hostname. SMTP server does not know it.