Zimbra server stopped sending emails

[netwerkdude]

Hi all,

I have had a zimbra server installed and working for about 2 weeks now. It was sending and receiving emails just fine until about 2 days ago.

Someone told me that that they did not receive an email, yet, i had been receiving emails fine. I looked at the que and saw errors for all email sent out that day.

All emails (to various destinations) had this error:

"host mx.messages said:450 sender address rejected: domain not found(in reply to rcpt to command)

I have not changed my config at all, so I dont understand a)why it worked before and now it does not suddenly and b) how to resolve it

I have googled this error code and not finding any solid answers on how to resolve. Anyone have any ideas? Thanks .

[jholder]

Have you made any changes to your DNS?

Also, can you describe a little about your setup? Do you host your own DNS/Split DNS. Is zimbra the MTA as well? Firewall?

[SpEnTBoY]

This may be over simplifying but it's a start. Have you verified your DNS is still functioning ok?

Because it's referenceing a "domain not found" and in response to RCPT, the error is suggesting that the domain for the recipient is not found (or not found to be valid) by your SMTP server which will rely on DNS to verify domains before relaying mail.

Were you able to test at all sending an email to an account that was not recieving email from a known good external source? (gmail/hotmail whatever)

regards,
Lonny

[netwerkdude]

Yes, I have a DNS server in the network and the mx record is still pointing to the correct server. I verified DNS fucntionality as best as i could by just seeing if it would resolve google.com etc. I have not made any changes to DNS recently.

Outside firewall is PIX and then DMZ and then the firewall protecting the LAN is a open sourced FW named Endian.

Thanks for both of your quick replies, I have been working on this all day and seem to figure what is going on. I sent an email to google and hotmail but it never made it. I send an email from them to my zimbra server and got it ok

[jholder]

So you can Get mail IN?
Can you run a zmlocalconfig and send it to me via e-mail:
jholder@zimbra.com

[netwerkdude]

Yes email gets in just fine. its not sending though. Stupid question, but where do I run that zmlocalconfig? I just tried from command line but I suspect I am in wrong directory?

[SpEnTBoY]

Yes email gets in just fine. its not sending though. Stupid question, but where do I run that zmlocalconfig? I just tried from command line but I suspect I am in wrong directory?

first:

su - zimbra

This should set your path correctly to execute the command

[SpEnTBoY]

Ok so outgoing mail isn't working at all? (sorry I missunderstood when you said someone hadn't recieved any emails, I thought they were on your network

One this to verify is wether or not the SMTP server actually sees you and your domain as valid. Are you comfortable using telnet?

We can verify domain and connectivity locally (and remotely) using telnet on 25 to test. What do you show for output regarding the following:

# telnet your.mail.server 25
Trying some.ip.address...
Connected to your.mail.server (some.ip.address).
Escape character is '^]'.
220 your.mail.server ESMTP Postfix
helo mail.server
250 your.mail.server
mail from: valid_user@your.mail.server
250 Ok
rcpt to: valid_user@your.mail.server
250 Ok
data
354 End data with .
this is a sample
.
250 Ok: queued as C958E20C4CF
quit
221 Bye
Connection closed by foreign host.

Substitute your.mail.server for your mail server and when you do the helo command ... just use your domain. I used the same account to send as I did recieve to test and make sure they are both valid accounts in your domain and on your mail server.

What do you get for errors?

[netwerkdude]

This is what I got from telnetting:

Escape character is '^]'.
220 oracle.cooterfamily.net ESMTP Postfix
helo oracle.cooterfamily.net
250 oracle.cooterfamily.net
mail from: michael@oracle.cooterfamily.net
250 Ok
rcpt to: michael@oracle.cooterfamily.net
250 Ok
data
354 End data with .
this is a test
.
250 Ok: queued as 7A34620104
quit
221 Bye
Connection closed by foreign host.
root@oracle:/home/lcooter#

I did not recieve it in my inbox though.

[SpEnTBoY]

Ok so we know that your SMTP server is at least issuing messages for que'ing AND that it accepts valid users for relaying within your domain. When you do this do you see any or the same message errors (or queue errors) from the administration interface for outgoing mail? Is anything being defered?

One thing to try to verify that the local telnet mail connection wasn't snubbed by DNS or valid MTA settings etc ... (and one thing I was not clear on) make sure the email addresses you specify are valid. IOW ... the From and To should be michael@cooterfamily.net rather than michael@oracle.cooterfamily.net

Test again and see if the message goes through and shows up in your email box.

regards,
Lonny