My question to Stefanno is if he could possibly add Xing as a social option.
I got xing in this way:
I took one of the social icons I wasn’t using (in this case “discord”) via FTP from:
newsletter/emails/themes/default/images/ (I am using the default theme)
and swapped it with the xing icon. I left the name of the file as “discord.png”. I then entered the details for the xing link in the box for Discord in the social icons area in the newsletter backend (settings -> company information -> social)
It is obviously not ideal and (potentially) needs to be manually updated every time the newsletter plugin is updated. But it works