Hestiacp and Postal mail server on same VPS

I have Hestiacp and Postal mail server installed on separate VPS. Hestiacp is configured with global relay to postal VPS to send emails and everything works fine.

Now I have setup Hestiacp and Postal mail server on same VPS. Postal mail server is configured to listen port 24 and is working fine. Hestiacp is also working fine and sending email without global smtp relay configured.

Now when I setup global smtp relay to postal which is running on same VPS, email stop working and I get below error in logs

2023-05-22 13:48:57 1q1425-0000YG-9D <= XXXXXXXXX U=XXXXX P=local S=1570
2023-05-22 13:48:57 1q1425-0000YG-9D remote host address is the local host: XXXXXXXXXXXX
2023-05-22 13:48:57 1q1425-0000YG-9D == XXXXXXXXXXXX R=send_via_smtp_relay defer (-1): remote host address is the local host
2023-05-22 13:48:57 1q1425-0000YG-9D Frozen
2023-05-22 13:49:25 1q142X-0001Dn-GX <= XXXXXXXXX U=XXXXXXXXX P=local S=451
2023-05-22 13:49:25 1q142X-0001Dn-GX remote host address is the local host: gmail.com
2023-05-22 13:49:25 1q142X-0001Dn-GX == XXXXXXXXXX R=send_via_smtp_relay defer (-1): remote host address is the local host
2023-05-22 13:49:25 1q142X-0001Dn-GX Frozen

Any help how I can fix this.

We don’t support it… I suggest strongly to keep the Postmail and Hestia on a separate VPS

Thanks for quick reply. Will keep them on separate VPS