Relay recipient blocklist

[zmweske]

First off, I love this application and thank you for creating and maintaining it.

Would you consider creating a blocklist as well? I think that one simple reason for this would be to block all emails sent to admin@admin.lan for some services so they don't spam a downstream SMTP provider (and prevent spam filtering).

Similar to the allowlist defined by --smtp-relay-matching, the blocklist would (in the same but opposite way- list below copied from #108 (comment)):

• auto-forwarding silents drops addresses on the blocklist (logged in debug), and sending all other matching addresses (if any). A disallowed address should not block any others from being sent.
• API / frontend will not allow any sending the address list contains invalid addresses, and return an error if any addresses are not allowed
• Frontend would ideally warn beforehand when entering the address

Haven't had time to set up a dev environment yet, but based on #108, it should be very similar with just the inverse logic and an extra branch for the config flag?

Thanks again for your work with this project!

[axllent]

Thank you for opening a new issue @zmweske. I will look into this in the near future and see what I can do.

[axllent]

@zmweske I have added this feature in v1.19.1 and is documented here.

Please let me know if this works as you expected?

[axllent]

I'm closing this issue as it was released a week ago. Please feel free to re-open if there are issues.

[zmweske]

Had been busy but finally got around to testing it out- works like a charm- thanks so much!

[axllent]

Great, thanks for the feedback!