My current email client is Horde webmail and today, I tried to simply respond to a message sent to me a couple of days ago.
The message delivery fails with the following message:
[wpfmb type=’error’ theme=2] “The size of the message you are trying to send exceeds a temporary size limit of the server. The message was not sent; try to reduce the message size or wait some time and try again. The server responded: 4.1.1 … temporary failure.”[/wpfmb]
For Solution: Open /etc/exim.conf file and change the message size limit according to your choice.
#!!# cPanel Exim 4 Config
disable_ipv6 = true
message_size_limit = 20M
smtp_accept_queue_per_connection = 50
hostlist loopback = <; 127.0.0.0/8 ; 0.0.0.0 ; ::1 ; 0000:0000:0000:0000:0000:ffff:7f00:0000/8
hostlist senderverifybypass_hosts = net-iplsearch;/etc/senderverifybypasshosts
hostlist skipsmtpcheck_hosts = net-iplsearch;/etc/skipsmtpcheckhosts
hostlist spammeripblocks = net-iplsearch;/etc/spammeripblocks
hostlist backupmx_hosts = lsearch;/etc/backupmxhosts
hostlist trustedmailhosts = lsearch;/etc/trustedmailhosts
hostlist relay_hosts = net-iplsearch;/etc/relayhosts
domainlist user_domains = ${if exists{/etc/userdomains} {lsearch;/etc/userdomains} fail}
remote_max_parallel = 10
smtp_receive_timeout = 165s
ignore_bounce_errors_after = 1d
rfc1413_query_timeout = 0s
timeout_frozen_after = 5d
auto_thaw = 7d
Then save and exit, That’s it.
On the off chance that still you are facing the same issues, try to disable firewall (CSF and APF) and check it.
If still facing issue after disabling firewall, try to reset the Exim configuration via WHM panel and try to access it, Definitely it will resolve your issue (Make sure, While resetting the Exim configuration you will lose your all manual configuration).