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[msuser]

Hi,

We have a couple of PowerMTA instances running on high configuration VMs. All of these servers are behind a load balancer.

We have multiple applications (end users) relaying emails through different VMTA.

Simple VMTA config that we have:

<virtual-mta hostname-mta-01>
     smtp-source-host 10.0.0.2 smtp.mydomain.com
</virtual-mta>
<virtual-mta hostname-mta-02>
     smtp-source-host 10.0.0.4 smtp.mydomain.com
</virtual-mta>

Can we keep the sub-domain (smtp.mydomain.com) same across all the PowerMTA instances ? Would this impact return-path in anyway ?

Please note all of the end users relaying through these servers set their From address/domain while feeding and don't set the return-path explicitly.
 
Any help is highly appreciated. Thanks.

[Jasdev Singh]

PowerMTA would not have a problem having the hostnames similar but you have valid questions on the return path. When a domain wants to bounce back to you, it is going to do a DNS lookup on your domain - having the same hostnames without a load balancer may not be best practice. TL;DR - Keep hostnames unique, have incoming/bounces fronted by a load balancer.

[msuser]

Thanks Jsingh for the response. Is there a way to set the return-path at the PMTA for all outgoing emails ? We would want to keep the return-path with the different domain from the From domain to be able to receive the remote bounces and process them through PMTA.

Thank you for the help.

[ReyM]

your return path is set by your SMTP-From

[msuser]

Thanks Reym. I understand that return-path is set to SMTP from. What I am looking for is a way to set the return-path at PMTA irrespective of FROM address coming from feeding application.

It's not very clear on the forum if it's possible to set return-path for all outgoing email through PMTA so asynchronous bounces come to a particular domain/address.

[ReyM]

I don't think that is an option. The SMTP from will be whatever your set in your vmta smtp-source-host ... In theory you could add your own return path header to the messages but I've never heard of that working well.

[CaLViN]

Not an option and doesnt seem logical.
You should handle this on your feeder side.