I am running Exchange 2003 SP2. Yesterday, we discovered that one of the organizations that we frequently email has implemented greylisting on their mail servers. They told us our messages were not getting through because our mail server did not understand how to respond to the error codes that the greylist program was sending back. So, our Exchange server was not properly re-queueing the messages for a re-delivery.
My question: Does anyone know how I need to change any settings on my Exchange server so that it will properly re-try so that it will be allowed through a greylist?
I don't believe that there is an actual error message. I thought it's just a temporary unavailable and then a resend automatically. Exchange is one of the mailservers that handle greylisting very well. They just resend within minutes. Possibly your client did not set up the greylist properly. You can also have them whitelist your domain.
Bj
"Rob" <R...@discussions.microsoft.com> wrote in message
>I am running Exchange 2003 SP2. > Yesterday, we discovered that one of the organizations that we frequently > email has implemented greylisting on their mail servers. > They told us our messages were not getting through because our mail server > did not understand how to respond to the error codes that the greylist > program was sending back. So, our Exchange server was not properly > re-queueing the messages for a re-delivery.
> My question: Does anyone know how I need to change any settings on my > Exchange server so that it will properly re-try so that it will be allowed > through a greylist?
Rob <R...@discussions.microsoft.com> wrote: >I am running Exchange 2003 SP2. >Yesterday, we discovered that one of the organizations that we frequently >email has implemented greylisting on their mail servers. >They told us our messages were not getting through because our mail server >did not understand how to respond to the error codes that the greylist >program was sending back. So, our Exchange server was not properly >re-queueing the messages for a re-delivery.
The respose should be a 4xx status, indicating a transient, retryable, error.
What did they tell you was the status they were sending?
What happens to the mail at yur side? Is it requeued? Retried? Returned as undeliverable?
>My question: Does anyone know how I need to change any settings on my >Exchange server so that it will properly re-try so that it will be allowed >through a greylist?
You don't have to do anything. The 4xx status will be retried on the schedule you set on the SMTP Virtual Server.
-- Rich Matheisen MCSE+I, Exchange MVP MS Exchange FAQ at http://www.swinc.com/resource/exch_faq.htm Don't send mail to this address mailto:h.p...@getronics.com Or to these, either: mailto:h.p...@pinkroccade.com mailto:melvin.mcphucknuc...@getronics.com mailto:melvin.mcphucknuc...@pinkroccade.com
The problem is that we don't get any kind of a response back from the other mail server. At least, none that I can see. When I contacted the other mail system admin, he told me that he saw the initial attempt in his logs. But, I couldn't find anything on my side that would indicate a retry. I didn't ask for the specific status that they were sending.
Can I just leave the default values on my SMTP Virtual Server for the retry to work correctly? Or should I tweak them?
Strange thing....Messages started going through shortly after I wrote this post. But, the initial message that was sent to that domain never made it through, and I don't believe an NDR was generated. It just looks like it was lost.
"Rich Matheisen [MVP]" wrote: > Rob <R...@discussions.microsoft.com> wrote:
> >I am running Exchange 2003 SP2. > >Yesterday, we discovered that one of the organizations that we frequently > >email has implemented greylisting on their mail servers. > >They told us our messages were not getting through because our mail server > >did not understand how to respond to the error codes that the greylist > >program was sending back. So, our Exchange server was not properly > >re-queueing the messages for a re-delivery.
> The respose should be a 4xx status, indicating a transient, retryable, > error.
> What did they tell you was the status they were sending?
> What happens to the mail at yur side? Is it requeued? Retried? > Returned as undeliverable?
> >My question: Does anyone know how I need to change any settings on my > >Exchange server so that it will properly re-try so that it will be allowed > >through a greylist?
> You don't have to do anything. The 4xx status will be retried on the > schedule you set on the SMTP Virtual Server.
> -- > Rich Matheisen > MCSE+I, Exchange MVP > MS Exchange FAQ at http://www.swinc.com/resource/exch_faq.htm > Don't send mail to this address mailto:h.p...@getronics.com > Or to these, either: mailto:h.p...@pinkroccade.com mailto:melvin.mcphucknuc...@getronics.com mailto:melvin.mcphucknuc...@pinkroccade.com
Rob <R...@discussions.microsoft.com> wrote: >The problem is that we don't get any kind of a response back from the other >mail server. At least, none that I can see.
Then they aren't greylisting.
>When I contacted the other mail system admin, he told me that he saw the >initial attempt in his logs. But, I couldn't find anything on my side that >would indicate a retry.
Do *you* see the conversation in your log? What was the status code returned in response to your command (probably to the RCPT TO if they're using the server/from/to triplet to greylist)?
>I didn't ask for the specific status that they were sending.
You shouldn't have to. It should be in your SMTP protocol log.
>Can I just leave the default values on my SMTP Virtual Server for the retry >to work correctly? Or should I tweak them?
I'd leave 'em alone. You should only have to retry once, and only on the 1st triplet. After that the messages should be accepted immediately (well, at least for some period of time).
>Strange thing....Messages started going through shortly after I wrote this >post. But, the initial message that was sent to that domain never made it >through, and I don't believe an NDR was generated. It just looks like it was >lost.
Your SMTP protocol logs would verify that.
-- Rich Matheisen MCSE+I, Exchange MVP MS Exchange FAQ at http://www.swinc.com/resource/exch_faq.htm Don't send mail to this address mailto:h.p...@getronics.com Or to these, either: mailto:h.p...@pinkroccade.com mailto:melvin.mcphucknuc...@getronics.com mailto:melvin.mcphucknuc...@pinkroccade.com
Rob wrote: > The problem is that we don't get any kind of a response back from the > other > mail server. At least, none that I can see. > When I contacted the other mail system admin, he told me that he saw > the > initial attempt in his logs. But, I couldn't find anything on my side > that > would indicate a retry. > I didn't ask for the specific status that they were sending.
> Can I just leave the default values on my SMTP Virtual Server for the > retry > to work correctly? Or should I tweak them?
> Strange thing....Messages started going through shortly after I wrote > this > post. But, the initial message that was sent to that domain never > made it > through, and I don't believe an NDR was generated. It just looks like > it was > lost.
>>> I am running Exchange 2003 SP2. >>> Yesterday, we discovered that one of the organizations that we >>> frequently >>> email has implemented greylisting on their mail servers. >>> They told us our messages were not getting through because our mail >>> server >>> did not understand how to respond to the error codes that the >>> greylist >>> program was sending back. So, our Exchange server was not properly >>> re-queueing the messages for a re-delivery.
>> The respose should be a 4xx status, indicating a transient, >> retryable, >> error.
>> What did they tell you was the status they were sending?
>> What happens to the mail at yur side? Is it requeued? Retried? >> Returned as undeliverable?
>>> My question: Does anyone know how I need to change any settings on >>> my >>> Exchange server so that it will properly re-try so that it will be >>> allowed >>> through a greylist?
>> You don't have to do anything. The 4xx status will be retried on the >> schedule you set on the SMTP Virtual Server.
>> -- >> Rich Matheisen >> MCSE+I, Exchange MVP >> MS Exchange FAQ at http://www.swinc.com/resource/exch_faq.htm >> Don't send mail to this address mailto:h.p...@getronics.com >> Or to these, either: mailto:h.p...@pinkroccade.com >> mailto:melvin.mcphucknuc...@getronics.com >> mailto:melvin.mcphucknuc...@pinkroccade.com
"Ole Thomsen" <o...@networks.dk> wrote: >Did you restart SMTP?
>I'm facing the same problem after upgrading to Exchange 2003 SP2.
>When sending to greylisting sites mail is not resent, and users get no >NDR.
>SMTP log shows only the first attempt, mailqueue and mailfolders are >empty.
>What's really weird is that after restarting SMTP the previously blocked >emails are resent - and users receive weeks or months old NDRs!?!
>I simply cannot figure out where these mails are stored until SMTP is >restarted?
They're in the databases (either .stm or .edb, depending on how they were sent).
-- Rich Matheisen MCSE+I, Exchange MVP MS Exchange FAQ at http://www.swinc.com/resource/exch_faq.htm Don't send mail to this address mailto:h.p...@getronics.com Or to these, either: mailto:h.p...@pinkroccade.com mailto:melvin.mcphucknuc...@getronics.com mailto:melvin.mcphucknuc...@pinkroccade.com
>>> What's really weird is that after restarting SMTP the previously >>> blocked emails are resent - and users receive weeks or months old >>> NDRs!?!
>>> I simply cannot figure out where these mails are stored until SMTP is >>> restarted?
>> They're in the databases (either .stm or .edb, depending on how they >> were sent).
>Thanks.
>Is there a way to monitor if there's any unsent mail - or will I have to >schedule a restart of SMTP to flush?
If you're not seeing the messages in the queue viewer then you have a problem that's different to "unsent mail". You shouldn't have to restart any services to cause messages to be delivered, or to apear in the queue viewer.
If you have any 3rd-party application on the server (anti-virus, anti-spam, etc.) try disabling (or removing) them.
-- Rich Matheisen MCSE+I, Exchange MVP MS Exchange FAQ at http://www.swinc.com/resource/exch_faq.htm Don't send mail to this address mailto:h.p...@getronics.com Or to these, either: mailto:h.p...@pinkroccade.com mailto:melvin.mcphucknuc...@getronics.com mailto:melvin.mcphucknuc...@pinkroccade.com
I have probably similar problem. I have also installing SP2 on Exchange 2003, but I don't restart anything.
After that, some customers which use graylisting, reports me problems with mail delivery from our company.
Than, after one month I have dismount Mailboxstore. After remount, Exchange send lot of old "lost" emails that was unset for SMTP erros like: Recipient address rejected: Greylisted Recipient address rejected: Service temporarily unavailable, please try later etc. and Exchange sent also old NDRs.
Ole: have you problems with mail delivery after you restart SMTP ?
