EXIM - Greylist problem with default configuration of exim in cPanel - Error from smtp 451 or 452

From wiki.morphey.org

Many providers have planned a system of graylist for the received emails.

Such system, sends back the upcoming messages with error 451 or 452.

When the file server sender receives this error message, automatically send the mail again. This allows to verify (from the file server recipient) the sender and therefore to correctly receive per second attempt the mail. Such verification served as this system, is used for verifying if the sender is a spammer or less.

With the configuration of default of exim that makes cPanel available, the send again of the mail is not anticipated to the return of these two codes of error.

To obviate to this problem, needs to modify the file of configuration of EXIM from the VHM of cPanel.

To go in "Advanced editor" and to insert in the last playpen in low this lace:

 
*  rcpt_4xx  F,10m,2m; F,2h,10m
 

In this way the mail will be sent when again from the file server recipient will be sent the error 451 or 542.

Some further information here: http://www.exim.org/exim-html-4.50/doc/html/spec_32.html#SECT32.3