"Client host rejected" for internal Mails.

[Nisse]

Hello,

we have a problem with our new Proxmox 2.0 Gateway.

We try to send a mail to the internet from our Lotus Notes Domino Server which IP is under the 'internal trusted hosts/networks' list to the IP of the Proxmox Gateway (192.168.100.21) Port 26, but still we get an error:

Router: Message 0035B830 NOT transferred via SMTP to 192.168.100.21:26 for john_doe@hotmail.com from John Doe/UO/O Size: 2K 450 4.7.1 Client host rejected: cannot find your hostname, [192.168.100.5]

I guess that is because of some reverse DNS checking, but why so for internal hosts? I wouldn't like to disable MX lookups under 'Mail Proxy Configuration - Relaying' because I really want that for outside hosts.

Any ideas?

Thank you for your help and kind regards, Nisse

 

[dietmar]

Hello,
I guess that is because of some reverse DNS checking, but why so for internal hosts? I wouldn't like to disable MX lookups under 'Mail Proxy Configuration - Relaying' because I really want that for outside hosts.

Is 'Reject Unknown Clients' activated?

(MailProxy/Options/RejectUnknownClients)

- Dietmar

 

[Nisse]

Yes, it is. Wrong? I mean, is an internal/trusted client considered to be 'unknown'?

 

[dietmar]

Yes, it is. Wrong? I mean, is an internal/trusted client considered to be 'unknown'?

No, should not - maybe you send to the wrong port? Make sure you send outgoing mail to the internal port (default 26).

- Dietmar

 

[Nisse]

As I quoted before:

Router: Message 0035B830 NOT transferred via SMTP to 192.168.100.21:26 for john_doe@hotmail.com from John Doe/UO/O Size: 2K 450 4.7.1 Client host rejected: cannot find your hostname, [192.168.100.5]

Proxmox Mail Proxy Configuration:

External SMTP Port : 25
Internal SMTP Port : 26

 

[tom]

As I quoted before:

Router: Message 0035B830 NOT transferred via SMTP to 192.168.100.21:26 for john_doe@hotmail.com from John Doe/UO/O Size: 2K 450 4.7.1 Client host rejected: cannot find your hostname, [192.168.100.5]

Proxmox Mail Proxy Configuration:

External SMTP Port : 25
Internal SMTP Port : 26

just to finish the thread: solution was found, problem was on the notes side (configure lotus notes to send on port 26 works now). here is the info (in german):
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Hier die Lösung für Lotus Notes Domino mit Proxmox als Gateway zum Versenden von Mails in das Internet:

Im Serverdokument des Lotus: Anschlüsse -> Internet Anschlüsse -> Mail
-> Mail (SMTP Ausgang) von Default 25 auf 26 ändern.

Unter 'Nachrichten': Einstellungen -> 'Relais Host für Nachrichten,
die die lokale Internet Domäne verlassen' -> IP des Proxmox angeben.

Auf der Domino Konsole: Tell SMTP Update Config


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if anyone need in english, just post.