Greylisting is automatically enabled by default for all your domains.
To switch off greylisting for all your domains, simply create an empty directory, within your home directory, called by the following pathname:
.spamcontrol/greylistingIn other words, within your home directory create a subdirectory called ".spamcontrol" and within that subdirectory create another directory called "greylisting". As soon as you do this, no more greylisting will be done for any of your domains.
After switching off greylisting as above, you can selectively re-enable it for any of your domains by creating a file with the same name as the domain name within your ".spamcontrol/greylisting" directory. For example, suppose you wish to switch on greylisting for a domain "example.com". To do this, create a file whose name relative to your home directory will be:
.spamcontrol/greylisting/example.comUse all lowercase letters in the above filename. If you use any uppercase characters in the filename, the resulting filename will have no effect on greylisting.
The directories and files above should be world-visible, i.e., the mail system should be able to test for their existence even if it runs as some username other than yours.
The rule used by the mail system for deciding whether or not to use greylisting can be algorithmically stated as follows. Suppose mail arrives for you and the domain in the destination address is "example.com". Then:
look within the user's home directory if a directory called .spamcontrol/greylisting DOES NOT exist then greylisting will be used else if a file called .spamcontrol/greylisting/example.com DOES exist then greylisting will be used else greylisting will not be used end if
If you have encountered any spam problems, we recommend that you allow greylisting to remain active for your domains.
More information about greylisting, and suggestions to minimize delayed mail, may be found on this page: Anti-Spam Techniques: How They Work .
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