Go Premium for a chance to win a PS4. Enter to Win

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 2872
  • Last Modified:

Mail Bounceback - #4.0.0 smtp;451-You have been greylisted.

Hi,

One of our clients has been receiving bouncebacks when sending to certain clients. Bounceback details shown below,

The e-mail system was unable to deliver the message, but did not report a specific reason.  Check the address and try again.  If it still fails, contact your system administrator.
 <***********.local #4.0.0 smtp;451-You have been greylisted. This is part of our standard anti-spam measures>

Our client is using exchange 2003 on 2003 server.
0
DSS01
Asked:
DSS01
1 Solution
 
anupnellipCommented:
Doest your mail server retry mails after some time . the other server si jusr graylistin your mails
Greylisting is a method of defending e-mail users against spam. A mail transfer agent (MTA) using greylisting will "temporarily reject" any email from a sender it does not recognize. If the mail is legitimate, the originating server will try again and the email is accepted. If the mail is from a spammer it will probably not be retried since a spammer goes through thousands of email addresses and cannot afford the time delay to retry

if you server retrys to send the mail again it should work .
0
 
FearNoMoreCommented:
Grey listing is an anti spam measure implemented by the "other" exchange server in the recipeint domain
Read the below mentioned article as it clealry explains what is "Grey Listing"
There is a known issue wherein sometimes these messages are ust "lost"
There is a hotfix with a reg mod for "Glitch Retry Interval" that can be set.
Once you go through this article you will understand
http://theessentialexchange.com/blogs/michael/archive/2007/11/16/exchange-2003-sp2-and-greylisting.aspx
 
0
 
abhaighCommented:
This article will help you understand what is going on - and includes a link to the pertinent hotfix

E-mail senders do not receive an indication that some messages have been held by Exchange Server 2003 until the SMTP service, the Microsoft Exchange Information Store service, or the Exchange server is restarted
http://support.microsoft.com/kb/950757/
0
 
MesthaCommented:
You shouldn't see that message. It is a 4.x.x error which is a temporary failure. The message should queue and then delivery tried again. There is a hotfix for the greylisting bug, but if you had that problem you wouldn't get a bounce back immediately. You would see the rejects when the SMTP Server service is restarted.
This is something else.

How do you route your email? Directly out by DNS or through another server?

Simon.
0

Featured Post

Important Lessons on Recovering from Petya

In their most recent webinar, Skyport Systems explores ways to isolate and protect critical databases to keep the core of your company safe from harm.

Tackle projects and never again get stuck behind a technical roadblock.
Join Now