How to fix exim Could not complete sender verify

Check if you can reach a remote server

dig a

If this timeouts then try over one of dns resolver directly

[~]# dig @ a

; <<>> DiG 9.11.4-P2-RedHat-9.11.4-26.P2.el7_9.2 <<>> @ a
; (1 server found)
;; global options: +cmd
;; connection timed out; no servers could be reached

Timeout means DNS resolver is dead

[~]# cat /etc/resolv.conf
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SMTP : Message size exceeds server limit

Check the message_size_limit value

exim -bP | grep message_size_limit

message_size_limit = 50M

Increase if needed in

Since recently:

Rebuild and restart exim:

service exim restart

If you’re still getting the problem please view the following explanation:

SMTP Error: Message size exceeds server limit


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How to get rid of “On behalf of” notices

If you want to get rid of "On behalf of" in your headers you need to set "Set SMTP Sender: headers" to off from the inside your Exim configuration

WHM –> Service Configuration –> Exim Configuration Manager –> Set SMTP Sender: headers

Should be OFF

grep local_from_check /etc/exim.conf.local
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