OpenEMM FAQ Database :: How do I set up the bounce management for delayed bounces?

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How do I set up the bounce management for delayed bounces?

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If you want to use the bounce management for delayed bounces you need to define a dedicated sender hostname for OpenEMM which is different from the existing host name of your server (see file "hosts" in directory "/etc"), and you have to set up a A record and a MX (Mail Exchanger) record in your Domain Name Server (DNS) for the sender hostname.

The MX record is used to route mail for a domain to one or more IP addresses. Sendmail needs the new (virtual) host as a destination, to forward all incoming response to, for further processing by OpenEMM.
In our example the regular hostname is ‘host’ and the sender hostname for OpenEMM will be ‘news’.

The (abbreviated) DNS entry looks like this:

---Domain: openemm.org---
                                 86400    IN    A          0    83.220.154.85
host                           86400    IN    A        10    83.220.154.85
news                          86400    IN    A    10    83.220.154.85
news.openemm.org.   86400    IN    MX    10    host.openemm.org.
---Domain: openemm.org---

The first line assigns the IP address for openemm.org and the second line defines the regular hostname. The third and fourth line define the A record and the MX record for sender hostname ‘news’, meaning that host ‘host’ accepts e-mails sent to host ‘news’.

Validate your correct setup by using a tool like ‘host’ or ‘dig’, for example

host –a openemm.org
host –a host.openemm.org
host –a news.openemm.org

When you send e-mails and want to take advantage of the bounce management for delayed bounces there are two possibilities for the format of the sender address:

1.) Use whatever address you like. Set up a bounce filter in OpenEMM (see user manual) to foward the filtered response to a feedback e-mail address of your choice (different from the sender address, of course). Implement a forward mechanism to forward incoming mail sent back to the sender address to the e-mail address generated by the bounce filter (in our example ext_1@news.openemm.org). The flow for responses of your e-mails works like this:

sender address -> filter-generated address (to filter out bounces) -> feedback address

2.) Use an e-mail address with the sender hostname (in our example news@news.openemm.org) Since no real e-mail addresses exist for the sender hostname, normally it would not be possible to reply to an e-mail with this ender address. To forward responses to a valid e-mail address you have to define a bounce filter with an e-mail feedback address of your choice. The e-mail address generated by the bounce filter (in our example ext_1@news.openemm.org) has to be defined as an alias in directory /home/openemm/conf/bav in a new file named bav.conf-local. Our example:

---File: /home/openemm/conf/bav/bav.conf-local----
news@news.openemm.org    alias:ext_1@news.openemm.org
---File: /home/openemm/conf/bav/bav.conf-local----

The flow for responses of your e-mails works like this:

sender address -> bav.conf-local -> filter-generated address -> feedback address

If you create the file bav.conf-local please do not forget to re-create it after an update of OpenEMM - otherwise ist would be missing!

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