Resolve "Anyone can send mails from a local user as long as the recipient is another local user"

[william-stacken]

Fixes #237

It works, but note that I have only tested this using my setup where this script is partially run in docker, so I haven't tested this using the vanilla script.

[LukeSmithxyz]

What's with the bizarre double echo command? Why not just echo "/^(.*)@$domain$/ \${1}" or something like that?

[william-stacken]

You need to escape any dots in the domain name (.) into (\.). For example, example.com should turn into example\.com. Hence the double echo with the sed command.

[LukeSmithxyz]

I'm going to assume that this bugfix is unnecessary after b657e768c9f9a9773b7767b286d1b16603ecd4ae, although if the issue persists, I'll merge this.