Do you use greylisting?
Question asked by Richard Frank - 12/15/2014 at 8:17 AM
I have customers complaining, and that's because the restransmit of the sending party takes too long.
my mailserver is configured to accept the second message afters 60 seconds.

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John Marx Replied
We use greylisting but when a client complains and we've explained to them why we also state that it can be turned off for email accounts. About half turn it off.
CCWH Replied
I can't see any reason not to use it, or to give clients the ability to disable it!
Remembering that clients rely upon you as an email admin to get emails to them, it's our job as an email admin to work tirelessly to make sure they get those emails securely too.  I think it would be a disservice if we simply changed the security to give get an email a little quicker for the first time.
We have it also set to 60 seconds retry.  Obviously some email servers will not retry immediately and that is where the delay may come in.  However, as an email admin I am more than happy to explain to clients the vast benefits to them, to the email server speed and to the larger community for the use of Greylisting.  No clients have the ability to change any security/spam/virus settings within our email servers.

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