OOB issues: stuck in loop and not-recognized DSN

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1

Hi again,

I was currently testing OOB, but appear to have trouble understanding why they’re not logged to the webhook.

For example:

User A sets cname for bounces.user.com to bounces.esp.net, this has an MX pointing the the incoming Kumo SMTP listener:

        listen = "0.0.0.0:2510", -- proxied to 25
        hostname = "bounces.esp.net", ... ommitted tls and banner property```

Message arrives, showing these logs with `kcli trace-smtp-server`:
```[10.2.11.0:25876->10.2.1.55:2510]    1s  -> ------33D00BEF02924490820158550AD524A1
[10.2.11.0:25876->10.2.1.55:2510]    1s  -> Content-Type: message/delivery-status
[10.2.11.0:25876->10.2.1.55:2510]    1s  -> Content-Description: Delivery report
[10.2.11.0:25876->10.2.1.55:2510]    1s  -> 
[10.2.11.0:25876->10.2.1.55:2510]    1s  -> Reporting-MTA: smtp; service.socketlabs.com
[10.2.11.0:25876->10.2.1.55:2510]    1s  -> Original-Recipient: rfc822; bounce-test@service.socketlabs.com
[10.2.11.0:25876->10.2.1.55:2510]    1s  -> Action: failed
[10.2.11.0:25876->10.2.1.55:2510]    1s  -> Status: 5.1.1
[10.2.11.0:25876->10.2.1.55:2510]    1s  -> Diagnostic-Code: SMTP; 550 No such recipient
[10.2.11.0:25876->10.2.1.55:2510]    1s  -> 
[10.2.11.0:25876->10.2.1.55:2510]    1s  -> ------33D00BEF02924490820158550AD524A1--
[10.2.11.0:25876->10.2.1.55:2510]    1s  -> 
[10.2.11.0:25876->10.2.1.55:2510]    1s  -> .
[10.2.11.0:25876->10.2.1.55:2510]    1s === smtp_server_message_received: Ok
[10.2.11.0:25876->10.2.1.55:2510]    1s === get_listener_domain domain=bounces.esp.net: Ok: Object {"log_arf": String("LogThenRelay"), "log_oob": String("LogThenRelay"), "relay_from": Array [], "relay_to": Bool(false), "ttl": String("1m")}
[10.2.11.0:25876->10.2.1.55:2510]    1s === Message from=<3e8.10.feedback=bounces.user.com@tracking.socketlabs.com> to=<feedback@bounces.esp.net> id=370482d0539711f0a6d0c2c86979c17c
[10.2.11.0:25876->10.2.1.55:2510]    1s === Message queue=default@bounces.esp.net relay=false log_arf="LogThenRelay" log_oob="LogThenRelay" was_arf_or_oob=Some(false) will_enqueue=Some(false)
[10.2.11.0:25876->10.2.1.55:2510]    1s === Message meta: ehlo_domain="s1-be0f.socketlabs.email-od.com"
[10.2.11.0:25876->10.2.1.55:2510]    1s === Message meta: hostname="bounces.esp.net"
[10.2.11.0:25876->10.2.1.55:2510]    1s === Message meta: received_from="10.2.11.0:25876"
[10.2.11.0:25876->10.2.1.55:2510]    1s === Message meta: received_via="10.2.1.55:2510"
[10.2.11.0:25876->10.2.1.55:2510]    1s === Message meta: reception_protocol="ESMTP"
[10.2.11.0:25876->10.2.1.55:2510]    1s === Message meta: tenant="default"
[10.2.11.0:25876->10.2.1.55:2510]    1s <-  550 5.7.1 relaying not permitted
[10.2.11.0:25876->10.2.1.55:2510]    1s  -> QUIT
[10.2.11.0:25876->10.2.1.55:2510]    1s <-  221 So long, and thanks for all the fish!
[10.2.11.0:25876->10.2.1.55:2510]    1s === Closed```

When using the socketlabs.com bounce test address, it shows log_oob "LogThenRelay" but doesn't call the webhook and it returns `relaying not permitted`.

Since the return path can be anything, we have this to rewrite the recipient:
```kumo.on('get_listener_domain', function(domain, listener, conn_meta)
    local is_bounce_listener = string.match(listener, ":2510$") ~= nil
    if is_bounce_listener then
        return kumo.make_listener_domain {
          log_oob = true,
          log_arf = true,
        }
    end
end)```
3

When using my own test address that generates an ARF, it is marked as was_arf_or_oob=Some(true) but still never calling the webhook:

[10.2.6.0:36431->10.2.1.65:2510]  49ms === get_listener_domain domain=bounces.esp.net: Ok: Object {"log_arf": String("LogThenRelay"), "log_oob": String("LogThenRelay"), "relay_from": Array [], "relay_to": Bool(false), "ttl": String("1m")}
[10.2.6.0:36431->10.2.1.65:2510]  50ms === Message from=<nobody@test.com> to=<feedback@bounces.esp.net> id=a36fe45d53a411f08da6d6327330ef62
[10.2.6.0:36431->10.2.1.65:2510]  50ms === Message queue=sandbox@bounces.esp.net![10.3.175.53] relay=false log_arf="LogThenRelay" log_oob="LogThenRelay" was_arf_or_oob=Some(true) will_enqueue=Some(true)```

I'm not sure what I am missing here. Appreciate the help! Webhook works fine for other events.
4

Ah - I found out what happened. Even though I have relay_to and relay_from disabled on this listener, it loops. I and up with a DSN message with hundreds of Received headers :sweat_smile: But because of hundreds of calls to the webhook (which contained Reception + Delivery) I looked over the OOB

          log_oob = true,
          log_arf = true,
          relay_to = false,
          relay_from = {}
        }```

With this disabled, I don't need the routing_domain overwrite right? Why would it still relay to itself?
5

and fwiw, this DSN is not recognized as OOB, resulting in the relaying not permitted error which is correct in that case.
message.txt (6.43 KB)

6

OOB issues: stuck in loop and not-recognized DSN

7

Sadly have not been able to fix it over the weekend. I can’t seem to figure out why it still tries to relay and why the socketlabs DSN is not recognized as one.

8

Pls submit a copy of the DSN as an issue on Github.

9

Will do! Currently moving to a new home so will take some time :sweat_smile: