Solved : Timed out while sending message body on Email Server

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If you get message “timed out while sending message body” on queue, please try to decrease MTU value on network interface. Default value of MTU are 1500. You can decrease into 1460 or below.

# Change MTU value temporary

Assuming your network interface are eth0

ifconfig eth0 mtu 1460

Please try requeue your email and check

# Change MTU value permanent

If using Ubuntu, please configure like example below

cat /etc/network/interfaces
# The primary network interface
auto eth0
iface eth0 inet static
mtu 1460

If using CentOS/Redhat/Fedora

cat /etc/sysconfig/network-scripts/ifcfg-eth0
# eth0

I don’t know what related about value of MTU and message “timed out while sending message body” on Queue. However, when i am decrease MTU value, my queue email gradually sent to recipient

Good luck and hopefully useful 🙂


  1. hi sir
    I install zimbra 8.8.9 network edition with oracle Linux ,but am facing same problem when we send email some particular domain is listing deferred area.I reduce MTU 1500 to 1250 that particular emails still listing deferred.
    getting below log
    sending end of data — message may be sent more than once)
    before we used 8.0.6 version working fine ,when i change to 8.8.9 problem came that time i use MTU 1500

  2. Good friend Iman,

    A query, I have installed the zimbra 8.8.6, which was working all well, but for a few months here, it is presenting failures of external shipping, since the output is queued and reflects the following message: timeout expired for connection. What do you need me to send you to be able to try to solve and help me with this failure.
    Thank you very much in advance.

    1. Hi Richard S,
      Is the problem with all outgoing emails? or some destination domains? please try using an external SMTP relay like sendgrid

  3. Hi Iman,

    Good day!
    I try this setup in my zimbra mail, but it doesn’t work. any suggestion please.
    My zimbra Version: 8.7.11_GA_3865.NETWORK

    Thank you.

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