Re: Restricting sending mail to domain or group

On Wed, 5 Dec 2018, Alexander Dalloz wrote:

...

I have a group alias (all@company.com). (1) Only company.com accounts should be able to send an email to everybody in that company via all@company.com. (2) - rather optional: refine the restrictions, e.g. two groups, grp1@company.com and grp2@company.com. Grp1 members should be able to send mails to grp2 but not vice versa.

Both to be setup on MTA side.

Agreed. You can manage your mailing lists with software (e.g. mailman), or hack in a filter between the (public) external and (secret) internal mailing list e.g.

# Forwards to grp1-secret@ if sender is approved
grp1: |/path/to/check-sender-filter

grp1-secret: :include:/path/to/grp1.list

If spoofing is a concern, you'll have to endow your filter with more intelligence.

Joseph Tam jtam.home@gmail.com