Unable to send message (random problem)

[alex5656]

Hello

Sorry for my english (I am French)
I have a random problem with the Zimbra webmail, Sometimes I cannot send message ..

Conf:
Zimbra 8.6.0_GA_1191.NETWORK
Ubuntu 14.04.5 LTS
Zmcontrol status OK / server restarted
Network : OK
DNS : OK

Error (from webmail):

Code: Select all

Critique
Une erreur réseau s'est produite.
method: [unknown]
msg: system failure: Unable to send message
code: service.FAILURE
detail: soap:Receiver
trace: qtp509886383-16118:http://************:80/service/soap/SendMsgRequest:1512636233075:326b6e6baae22ef0
request:

Body: {
  SendMsgRequest: {
    _jsns: "urn:zimbraMail",
    m: {
      e: [
        // [0]:
        {
          a: "titi@tutu.com",
          t: "t"
         },
        // [1]:
        {
          a: "tata@toto.fr",
          p: "toto",
          t: "f"
         }
       ],
      idnt: "268d5cb9-b6cc-4098-8324-afdba70a19ee",
      mp: [
        // [0]:
        {
          ct: "multipart/alternative",
          mp: [
            // [0]:
            {
              content: {
                _content: "

"
               },
              ct: "text/plain"
             },
            // [1]:
            {
              content: {
                _content: "...;"
               },
              ct: "text/html"
             }
           ]
         }
       ],
      su: {
        _content: "test1"
       }
     },
    suid: 1512636279117
   }
},
Header: {
  context: {
    _jsns: "urn:zimbra",
    account: {
      _content: "tata@toto.fr",
      by: "name"
     },
    authToken: "(removed)",
    csrfToken: "0_29a1effc65ee1c6551921b2ed5a8830e44821224",
    notify: {
      seq: 5
     },
    session: {
      _content: 15592,
      id: 15592
     },
    userAgent: {
      name: "ZimbraWebClient - FF57 (Win)",
      version: "8.6.0_GA_1191"
     }
   }
}

zmcontrol status

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Host ****
        amavis                  Running
        antispam                Running
        antivirus               Running
        ldap                    Running
        logger                  Running
        mailbox                 Running
        memcached               Running
        mta                     Running
        opendkim                Running
        service webapp          Running
        snmp                    Running
        spell                   Running
        stats                   Running
        zimbra webapp           Running
        zimbraAdmin webapp      Running
        zimlet webapp           Running
        zmconfigd               Running

Thanks for your help