[SOLVED] How to relay incoming from multiple mail server through proxmox mailgateway

[InGenetic]

Hi all,

is that possible to relay inbound (incoming mail) from multiple mail server using 1 proxmox mail gateway ,
i've tried , but it's always failed, only success for one mail server , the example as below :

- proxmox mailgateway = pmg.abc.com ( public ip address :1.1.1.1)
- mail server1 = mail.abc.com (public ip address 2.2.2.2)
- mail server2 = mail.xyz.com (public ip address 3.3.3.3)
- mail server3 = mail.yyy.com (public ip address 4.4.4.4)

what i try to do is :
1. relaying = set default relay to mail.abc.com (2.2.2.2)
2. relay domain =
- abc.com
- xyz.com
- yyy.com
3. port default =
External SMTP Port = 25
Internal SMTP port = 26
4. Option = default
5. Transport =
- relay domain = abc.com , host = mail.abc.com , SMTP , port 26 , Use MX= No
- relay domain = xyz.com , host = mail.xyz.com , SMTP , port 26 , Use MX= No
- relay domain = yyy.com , host = mail.yyy.com , SMTP , port 26 , Use MX= No
6. Network =
- 1.1.1.1/32
- 2.2.2.2/32
- 3.3.3.3/32
- 4.4.4.4/32
7. TLS = default (all No)
8. DKIM = Default
9. Whitelist = (domain sender)
- abc.com
- xyz.com
- yyy.com

but the proxmox mail gateway can only relay incoming mail server which is defaut relay = mail.abc.com (2.2.2.2)
the others mail server can not relay incoming mail server, and stuck on proxmox mail gateway

Note: all MTA mail server already set relay to : pmg.abc.com:26
for outgoing email is working fine , but for incoming mail only 1 server can relay through proxmox mail gateway

can anyone help me, if possible to relay incominng from multiple mail server using 1 proxmox gateway.
i've no idea how to setup this condition.

Thanks n regards,

 

[Stoiko Ivanov]

Usually you just set the MX record for abc.com, xyz.com, yyy.com to pmg.abc.com - then all mail from the internet goes to pmg (which then needs transport (GUI->Configuration->MailProxy entries (abc.com -> mail.abc.com (port 25), xyz.com -> mail.xyz.com, ...))

This should work - if not provide the logs of pmg when receiving mail

I hope this helps!

 

[InGenetic]

Hi mr.Stoiko Ivanov,

Thanks for your reply, fyi for all mx record mail server already set to pmg.abc.com with priortiy 0, and priority 10 for their mail server it self (ex:mail.abc.com, priority 0) what i've not to set they port using 25 on transport, by the way how about the use mx option on transport for all mail server ? Use or not for Mx option?


By the way how about the external smtp relay for each mail server ? Still using pmg.abc.com:26 ? Or 25?

Please advice

 

[Stoiko Ivanov]

and priority 10 for their mail server it self

keep in mind that in some cases spammers do/did target lower-prio MX to bypass spam-detection - which would happen in your case

what i've not to set they port using 25 on transport

this is needed so that PMG knows where to send the mail to...

y the way how about the external smtp relay for each mail server ? Still using pmg.abc.com:26 ?

port 25 is the external port - port 26 the internal one - from the internal port all IPs in the trusted networks can send mails everywhere, on the internal port only mails _for_ the relay domains should be accepted

this is all quite well explained in the reference documentation:
https://pmg.proxmox.com/pmg-docs/pmg-admin-guide.html#chapter_deployment

 

[InGenetic]

keep in mind that in some cases spammers do/did target lower-prio MX to bypass spam-detection - which would happen in your case


this is needed so that PMG knows where to send the mail to...


port 25 is the external port - port 26 the internal one - from the internal port all IPs in the trusted networks can send mails everywhere, on the internal port only mails _for_ the relay domains should be accepted

this is all quite well explained in the reference documentation:
https://pmg.proxmox.com/pmg-docs/pmg-admin-guide.html#chapter_deployment

Hi mr. Stoiko Ivanov,

Thanks now my proxmox already running, and i have to learn about the all free feature on proxmox mail gateway , before we decided to subscribe next level ( for my company use )

btw about this :

keep in mind that in some cases spammers do/did target lower-prio MX to bypass spam-detection - which would happen in your case

it's mean we just create 2 mx entry on each mail server , ex: priorty 0 to pmg site , and priority 20 to our mx backup ? and not entry our mail server mx ( mail.abc.com ) ? on mx record of domain abc.com ? is it right sir ?

 

[Stoiko Ivanov]

it's mean we just create 2 mx entry on each mail server , ex: priorty 0 to pmg site , and priority 20 to our mx backup ?

yes - that would sound reasonable - make sure your backup mx relays the mails to pmg