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
# The primary network interface auto eth0 iface eth0 inet static address 192.168.11.11/24 gateway 192.168.11.1 dns-nameservers 192.168.11.11 192.168.11.1 188.8.131.52 dns-search imanudin.net mtu 1460
If using CentOS/Redhat/Fedora
# eth0 DEVICE=eth0 BOOTPROTO=none ONBOOT=yes IPADDR=192.168.11.11 NETMASK=255.255.255.0 GATEWAY=192.168.1 MTU="1460"
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 🙂
Very useful article. This method worked for me too. Thanks.
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
You can try to relay your email to your another Zimbra (8.0.6) to compare the problem
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.
Hi Richard S,
Is the problem with all outgoing emails? or some destination domains? please try using an external SMTP relay like sendgrid
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
Please try SMTP relay. is the problem solved or not?
terimakasih mas iman, kendala saya sdh teratasi dengan mengubah size MTU di mail server saya.
Hi mas Ardi,