IIS SMTP Queue very slow

thomp361
thomp361 used Ask the Experts™
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We use IIS 6.0 to send out some of our mass emails.

I noticed the queue folder is getting pretty big (2,000 emails).  Some of these messages in particular need to get out today to a domain we'll call domainXYZ.com

I looked in the IIS SMTP log and it's doesn't appear as though it has attempted a connection with domainXYZ.com and yet they sit in the queue folder.  I also checked the event viewer and there is nothing about domainXYZ.com

I then used telnet to connect and send a test message to domainXYZ.com and it went through ok.

I am not sure what else I can do to see what's is going on here, any ideas?
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Praveen DMInfra Team Lead
Top Expert 2008

Commented:
Restart SMTP services and make sure you send out 100s packed mails and not 1000's, Sometimes your server IP might get black listed for Spaming and might get into blacklisted IP address..

So just restart the SMTP services and send mails in limited way .

RUN > Services.msc
Restart SMTP services.

And check the mail flow...
Praveen DMInfra Team Lead
Top Expert 2008

Commented:
Hope you do not have the AV enabled to check out going files ...and Any FW in your server...
Praveen DMInfra Team Lead
Top Expert 2008

Commented:
As and when the files in SMTP mail delivery folder increases the service will slow down..Make sure your AV or FW is not running in server that might cause futher delay.
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Praveen DMInfra Team Lead
Top Expert 2008

Commented:
More Idea abt IIS - SMTP and its settings

http://www.windowsitlibrary.com/Content/141/09/2.html

Author

Commented:
Thanks for the response servoadmin.

There is no AV software on the machine.

Don't think we're blacklisted by the domainXYZ.com if I could send via telnet.

What do you mean by "you send out 100s packed mails and not 1000's"..?
Praveen DMInfra Team Lead
Top Expert 2008

Commented:
If you check the SMTP mails delivery folder you can see the files just make sure you flush and keep an eye on that folder just to maintain a normal number of mails ...

Author

Commented:
How do I "flush" the folder?
Praveen DMInfra Team Lead
Top Expert 2008

Commented:
;-) .. Deleting files and nothn else.. :-)

Commented:
You'd also try IIS SMTP Monitor freeware from http://www.hoststools.com/

Author

Commented:
I can't delete the other emails, they need to be sent too!

Author

Commented:
Netocrat, I don't think that tool will work, the other files (emails) that are in the folder are legit and not from a 3rd party source.
Commented:
You can stop SMTP, move emails to other folder (temp.) then run SMTP and move them back in small portions of 50-100 emails back. Add new portion when the old one has been sent already. It is a temp. solution, but it should help.

As a permanent way - install some free mailserver, e.g. hMailServer and send all emails with it. IIS SMTP is a joke.

Author

Commented:
I think you're right, the real solution to this is a different MTA which we're in the process of integrating...IIS SMTP is a joke.  Thanks for comfirming at least!

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