What means "451 Greylisting enabled"?

[sara]

Hi,

I have a problem to send my emails thruogh Microsoft Outlook. Immediately
after sending I receive automatic email below and no email send.
Please advise how I can solve this case.Thanks.

Your message did not reach some or all of the intended recipients.

Subject: 7777
Sent: 6/16/2006 10:32 PM

The following recipient(s) could not be reached:

xxxxxxxxxxxxx on 6/16/2006 10:32 PM
451 Greylisting enabled, try again in 15 minutes

 

[Milly Staples - MVP Outlook]

http://www.google.com is your friend.

--
Milly Staples [MVP - Outlook]

Post all replies to the group to keep the discussion intact. All
unsolicited mail sent to my personal account will be deleted without
reading.

After furious head scratching, sara asked:

| Hi,
|
| I have a problem to send my emails thruogh Microsoft Outlook.
| Immediately after sending I receive automatic email below and no
| email send.
| Please advise how I can solve this case.Thanks.
|
| Your message did not reach some or all of the intended recipients.
|
| Subject: 7777
| Sent: 6/16/2006 10:32 PM
|
| The following recipient(s) could not be reached:
|
| xxxxxxxxxxxxx on 6/16/2006 10:32 PM
| 451 Greylisting enabled, try again in 15 minutes