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Zimbra mailflow down without obvious error reported

Hello

Having a somewhat surprising issue - our mail flow on our Zimbra server is down (both inbound and outbound) yet the server seems healthy and no error seems reported.

1. Server is up (8.8.10_GA_3786) on Ubuntu 16
2. Admin health status page shows every service up & running (green)
3. Webmail access is ok
4. IMAP access is ok

However, no mail is flowing in or out.

Trying to send triggers the following errors:

SMTP

19:03:25 Ready to run action (retry count: 0)
19:03:25 Clearing connection to zimbrams.domain.com
19:03:25 Trying to connect to zimbrams.domain.com on port 465 (CFNetwork) with STARTTLS (required)
19:03:25 Resolved hostname (zimbrams.domain.com).
19:03:25 Error: Connection error (Connection refused).
19:03:25 Error code: 2
19:03:25 Failed action (0). Reset observed read/write timeouts: 8/8

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MBP13:~ alex$ telnet zimbra.domain.com 25
Trying *.*.187.68...
telnet: connect to address *.*.187.68: Connection refused
telnet: Unable to connect to remote host
MBP13:~ alex$

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(ie the connexion is actively refused)

webmail

method:	[unknown]
msg:	try again: Unable to connect to the MTA
code:	mail.TRY_AGAIN
detail:	soap:Receiver
trace:	qtp66233253-2518:1568314842997:7a36c58c222c3898
request:	
Body: {
  SendMsgRequest: {
    _jsns: "urn:zimbraMail",
    m: {
      e: [
        // [0]:
        {
          a: "someone@gmail.com",
          t: "t"
         },
        // [1]:
        {
          a: "admin@zimbrams.domain.com",
          t: "f"
         }
       ],
      idnt: "fdaaff9d-bd65-4f04-b5ee-4692c0ee90e8",
      mp: [
        // [0]:
        {
          ct: "multipart/alternative",
          mp: [
            // [0]:
            {
              content: {
                _content: "hello world 
"
               },
              ct: "text/plain"
             },
            // [1]:
            {
              content: {
                _content: "&lt;html&gt;&lt;body&gt;&lt;div style=&quot;font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000&quot;&gt;&lt;div&gt;hello world&lt;/div&gt;&lt;/div&gt;&lt;/body&gt;&lt;/html&gt;"
               },
              ct: "text/html"
             }
           ]
         }
       ],
      su: {
        _content: "testing"
       }
     },
    suid: 1568314842841
   }
 },
Header: {
  context: {
    _jsns: "urn:zimbra",
    account: {
      _content: "admin@zimbrams.domain.com",
      by: "name"
     },
    authToken: "(removed)",
    csrfToken: "0_04e21bcd2b1d72b11a7f5ebf43336178b6293c08",
    notify: {
      seq: 2
     },
    session: {
      _content: 11216,
      id: 11216
     },
    userAgent: {
      name: "ZimbraWebClient - GC76 (Mac)",
      version: "8.8.10_GA_3786"
     }
   }
 }

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How would you go about this one ?

ASKER CERTIFIED SOLUTION

Sanga Collins

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Alexandre Takacs

ASKER

thanks for the pointer - I have managed to track down the issue (it way some strange permissions issue)