How to disable returning email

[Chris66]

Hello,

How to disable return email?
For spam quarantine area, I can see many email address that doesn't exist on email server and our company IP address always blocks by RBL.
I don't know why, maybe we got too many spam, and return too many email to sender.

 

[hata_ph]

Try Mail Proxy -> Options -> Send NDR on Blocked Emails = No.

 

[Stoiko Ivanov]

please provide some logs of such e-mails from PMG - else it's hard to find out what the exact problem is like:
* one interpretation - as @hata_ph correctly pointed out is that you mean the NDR(bounces) sent out for undeliverable mail
* another interpretation is that your PMG's dns-resolver is over-quota with certain DNSBLs and thus your downstream server then rejects the mail
(check out the getting started guide on our wiki regarding how to improve this:
https://pmg.proxmox.com/wiki/index.php/Getting_started_with_Proxmox_Mail_Gateway)
* yet another possibility is that you did not enable recipient verification (Configuration->Mail Proxy->Options) and thus PMG has to accept every address in one of your relay domains, without checking if the downstream server would accept it at all

I hope this helps!

 

[Chris66]

I attach the option setting for your reference. Please recommend me how to configure the setting to prevent our company IP address to be blocked again.

 

[Chris66]

please provide some logs of such e-mails from PMG - else it's hard to find out what the exact problem is like:
* one interpretation - as @hata_ph correctly pointed out is that you mean the NDR(bounces) sent out for undeliverable mail
* another interpretation is that your PMG's dns-resolver is over-quota with certain DNSBLs and thus your downstream server then rejects the mail
(check out the getting started guide on our wiki regarding how to improve this:
https://pmg.proxmox.com/wiki/index.php/Getting_started_with_Proxmox_Mail_Gateway)
* yet another possibility is that you did not enable recipient verification (Configuration->Mail Proxy->Options) and thus PMG has to accept every address in one of your relay domains, without checking if the downstream server would accept it at all

I hope this helps!

Could you tell me where I can find the log option?

 

[Stoiko Ivanov]

Could you tell me where I can find the log option?

The mail.log are the files '/var/log/mail.log,/var/log/mail.log.1, /var/log/mail.log.*.gz' - you can also see the logs in the Tracking Center in the GUI
Keep in mind that the logs contain sensitive data (mail-addresses, ip-addresses,....) - so you might want to anonymize them

The settings look ok so far - I would check in the logs why you end up on the blacklist (usually there is a hint when someone puts you on a blacklist)

else - verify that you have only trusted addresses set in the trusted networks (GUI->Configuration->Mail Proxy->Networks) - additionally make sure that all your internal systems are using the internal port, and that the internet reaches only the external port of PMG
https://pmg.proxmox.com/pmg-docs/pmg-admin-guide.html#chapter_deployment

I hope this helps!