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The server has reached its limit for processing requests from your host.\n451 Please try again later

The server has reached its limit for processing requests from your host.\n451 Please try again later. It generally appears when your server simultaneous incoming connections limit exceeded. So to resolve the issue please increase the incomming connection limit in server’s exim.conf file.
By default simultaneous incoming connections limit : 100

#vi /etc/exim.conf
smtp_accept_max = 200
#service exim restart

Now issue should be resolved.

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I am founder and webmaster of www.linuxpcfix.com and working as a Sr. Linux Administrator (Expertise on Linux/Unix & Cloud Server) and have been in the industry from last 7 years.

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