Remove queued mail from a sender domain?

get-help
1

My Lua skills are not top notch and I could not find a full answer in the help. If I want to remove mail from a sender domain which I don’t want to send anymore.. Would this piece of code then nuke all that mail silently? I do have mail with different subdomains.. Is there a way to regex match… there probably is, but I did not find it yet in the lua tutorials I quickly skimmed.

kumo.on('requeue_message', function(msg)
  local queue = msg:get_queue_name()
  local mydomain = msg:from_header().domain
  -- domain should be an array
  if mydomain == "news.domainname.com" and msg:num_attempts() >= 1 then
    -- move to nill queue and thus nuking it?
    msg:set_meta('queue', 'nill')
  end
end)
3

That looks sane theoretically but requeue_message only works on currently trans failed messages. It will not do anything to messages that are at rest in the queue.

4

We have an admin bounce function that might be more useful

5
6

You can invoke that with kcli so it can be done from an external app

7

Use the —domain switch to do the same thing your script does above.

8

It will natively remain active for 5 minutes to catch any new injections. You can extend that with the —duration switch.

9

note that the bounce command works on the recipient domain, not the sender domain

10

You can’t msg:set_meta('queue', 'null') after reception, because there isn’t actually a null queue, it is a special label used at reception time to skip inserting into any queues.

11

What I would suggest is to define a rebind_message event:

kumo.on('rebind_message', function(msg, data)
  if some_condition then
    kumo.reject(500, "don't send this any more")
  end
end)

then run:

$ kcli rebind --everything --trigger-rebind-event

that will cause every message from every queue to be passed through the rebind_message event. The kumo.reject will cause matching messages to bounce.

12

re: regex, lua has built in matching functions, but the syntax is… unusual. We have our own compile - KumoMTA Docs that uses the more familiar pcre style regex syntax

13

Thanks Wez… I will go for the rebind_message solution as I need to ditch mail from a certain sender

14

^^^ Ohh that is much better :slightly_smiling_face:

15

Was that sender in its own tenant?

16

no, it was in a shared warmup tenant… but crap got injected.

17

nothing to warmup :frowning_face_with_open_mouth:

18

Ugh.

19

I’d try to have a shared pool and individual tenants.

20

that is actually something to think about

21

I did do this as suggested but I am not seeing bounces (in the logs) on the domains I want to clear. So probably my condition is not right. Is this about right?

kumo.on('rebind_message', function(msg, data)
  local mydomain = msg:from_header().domain
  -- domain should be an array
  if mydomain == "newsletter.domain.com" then
    kumo.reject(500, "don't send this any more")
  end
end)

Then I did:
kcli rebind --everything --trigger-rebind-event --reason "Need to cleanup some domains"