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[Salmoneus]

No mail is accepted by Proxmox, error 450

I am a new Proxmox user, and I have installed a free version of the server for testing. The server is located between an existing mail gateway (to be replaced...) and our internal mail server. I have added the internal server as the "default relay" and the mail gateway as "smarthost".

My problem is that no mail is accepted by Proxmox. This is a typical error:

NOQUEUE: reject: RCPT from mailserver.domain.com[192.168.0.50]: 450
<user@domain.com>: Recipient address rejected: Service is
unavailable (try later); from=<sender@anotherdomain.com>
to=<user@domain.com> proto=ESMTP helo=<domain.com>

The "user@domain.com" is a valid user on the internal mail server.

I got it to work once, and now I don't know what broke it. When it "worked" it only accepted mails to recipients that have a user account on the internal mail server, even though I have not enabled neither "Reject Unknown Clients" nor "Verify Receivers".

What I mean is that "name.lastname@domain.com" is an alias to "name", which is the actual user account, and that has to be a valid recipient too!

Any hints on what could be causing this?

/Salmoneus

 

[Salmoneus]

I don't know where that topic name came from

Must have slipped somewhere...

Any way to edit that...?

 

[tom]

My problem is that no mail is accepted by Proxmox. This is a typical error:

NOQUEUE: reject: RCPT from mailserver.domain.com[192.168.0.50]: 450
<user@domain.com>: Recipient address rejected: Service is
unavailable (try later); from=<sender@anotherdomain.com>
to=<user@domain.com> proto=ESMTP helo=<domain.com>

The "user@domain.com" is a valid user on the internal mail server.

I got it to work once, and now I don't know what broke it. When it "worked" it only accepted mails to recipients that have a user account on the internal mail server, even though I have not enabled neither "Reject Unknown Clients" nor "Verify Receivers".

What I mean is that "name.lastname@domain.com" is an alias to "name", which is the actual user account, and that has to be a valid recipient too!

Any hints on what could be causing this?

/Salmoneus

hi,
"450 errors Recipient address rejected: Service is unavailable (try later)" means that the message is greylistet, this is enabled by default (you can disable it for testing on the web interface, Configuration/Mail Proxy/Options.

for details see Filtering methods - greylisting

 

[tom]

I don't know where that topic name came from

Must have slipped somewhere...

Any way to edit that...?

I changed the subject,

 

[Salmoneus]

Greylisting was the "problem"! I also notice that SPF stopped a lot of mail...

Thanks!