IIS Virtual SMTP help needed please!

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badgerfruit

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I'm sorry for the title description, it was the best I could think of lol.
OK, my problem is that the company I work for use a Virtual SMTP server which runs under IIS7. We have a number of customers who are saying they don't receive our emails.

We've looked in the logs and can see the following:-
Code: 
2010-05-17 15:34:44 xx.xx.xx.xx OutboundConnectionResponse SMTPSVC1 MPLWSPR03 - 25 - - 250+2.6.0++<[email protected]>+Queued+mail+for+delivery 0 0 84 0 5953 SMTP - - - -
xx.xx.xx.xx is the IP address of the 3rd party email server.

My question is:-
Where is this "Queued for delivery" message coming from?
Is it OUR email server unable to deliver the email or is it the 3rd party email server telling us it's received the email but has queued it to delivery it "internally"?

The full conversation is shown below FYI:

xx.xx.xx.xx = 3rd party email server IP address
yy.yy.yy.yy = Our email server IP address

Code: 
2010-05-17 15:34:37 yy.yy.yy.yy MPLPRPR05 SMTPSVC1 MPLWSPR03 10.0.10.13 0 RCPT - +TO:+<[email protected]> 250 0 37 35 0 SMTP - - - -
2010-05-17 15:34:37 xx.xx.xx.xx OutboundConnectionCommand SMTPSVC1 MPLWSPR03 - 25 RCPT - TO:<[email protected]> 0 0 4 0 125 SMTP - - - -
2010-05-17 15:34:37 xx.xx.xx.xx OutboundConnectionResponse SMTPSVC1 MPLWSPR03 - 25 - - [email protected]+ 0 0 35 0 172 SMTP - - - -

2010-05-17 15:34:37 xx.xx.xx.xx OutboundConnectionResponse SMTPSVC1 MPLWSPR03 - 25 - - 220+********************************************************************************************************** 0 0 110 0 31 SMTP - - - -
2010-05-17 15:34:37 xx.xx.xx.xx OutboundConnectionCommand SMTPSVC1 MPLWSPR03 - 25 EHLO - MPLWSPR03.domain.local 0 0 4 0 31 SMTP - - - -
2010-05-17 15:34:37 xx.xx.xx.xx OutboundConnectionResponse SMTPSVC1 MPLWSPR03 - 25 - - 250-domain.co.uk+Hello+[yy.yy.yy.yy] 0 0 37 0 78 SMTP - - - -
2010-05-17 15:34:37 xx.xx.xx.xx OutboundConnectionCommand SMTPSVC1 MPLWSPR03 - 25 MAIL - FROM:<[email protected]> 0 0 4 0 78 SMTP - - - -
2010-05-17 15:34:37 xx.xx.xx.xx OutboundConnectionResponse SMTPSVC1 MPLWSPR03 - 25 - - [email protected]+OK 0 0 48 0 125 SMTP - - - -
2010-05-17 15:34:37 xx.xx.xx.xx OutboundConnectionCommand SMTPSVC1 MPLWSPR03 - 25 RCPT - TO:<[email protected]> 0 0 4 0 125 SMTP - - - -
2010-05-17 15:34:37 xx.xx.xx.xx OutboundConnectionResponse SMTPSVC1 MPLWSPR03 - 25 - - [email protected]+ 0 0 35 0 172 SMTP - - - -
2010-05-17 15:34:37 xx.xx.xx.xx OutboundConnectionCommand SMTPSVC1 MPLWSPR03 - 25 DATA - - 0 0 4 0 172 SMTP - - - -
2010-05-17 15:34:37 xx.xx.xx.xx OutboundConnectionResponse SMTPSVC1 MPLWSPR03 - 25 - - 354+Start+mail+input;+end+with+<CRLF>.<CRLF> 0 0 44 0 219 SMTP - - - -
[B]2010-05-17 15:34:44 xx.xx.xx.xx OutboundConnectionResponse SMTPSVC1 MPLWSPR03 - 25 - - 250+2.6.0++<[email protected]>+Queued+mail+for+delivery 0 0 84 0 5953 SMTP - - - -[/B]
2010-05-17 15:34:44 xx.xx.xx.xx OutboundConnectionCommand SMTPSVC1 MPLWSPR03 - 25 QUIT - - 0 0 4 0 5969 SMTP - - - -
2010-05-17 15:34:44 xx.xx.xx.xx OutboundConnectionResponse SMTPSVC1 MPLWSPR03 - 25 - - 221+2.0.0+domain.co.uk+Service+closing+transmission+channel 0 0 57 0 6047 SMTP - - - -
*Ip addresses have been changed to protect the guilty ... I mean innocent.
 
Last edited:

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Computer Manufacturer/Model Number
IBM / Lenovo
OS
windows / Linux - Depending on mood
CPU
3GHZ P4HT
Motherboard
IBM / Lenovo
Memory
1GB
Graphics Card(s)
NV6200
Sound Card
On-board - Soundmax
Monitor(s) Displays
32" Sony Bravia
Screen Resolution
1024/768
Hard Drives
40GB IDE / Make varies depending on OS as I build 1 HDD for each and swap at will.
PSU
Standard
Case
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Cooling
Standard
Keyboard
Logitech Wireless EX110
Mouse
Logitech Wireless EX110
Internet Speed
20MB Cable
Other Info
Badgerlan has 9 machines - 5 servers & 4 clients; total disk space is about 6TB and increasing!!
badgerfruit said:
I'm sorry for the title description, it was the best I could think of lol.
OK, my problem is that the company I work for use a Virtual SMTP server which runs under IIS7. We have a number of customers who are saying they don't receive our emails.

We've looked in the logs and can see the following:-
Code: 
2010-05-17 15:34:44 xx.xx.xx.xx OutboundConnectionResponse SMTPSVC1 MPLWSPR03 - 25 - - 250+2.6.0++<[email protected]>+Queued+mail+for+delivery 0 0 84 0 5953 SMTP - - - -
xx.xx.xx.xx is the IP address of the 3rd party email server.

My question is:-
Where is this "Queued for delivery" message coming from?
Is it OUR email server unable to deliver the email or is it the 3rd party email server telling us it's received the email but has queued it to delivery it "internally"?

The full conversation is shown below FYI:

xx.xx.xx.xx = 3rd party email server IP address
yy.yy.yy.yy = Our email server IP address

Code: 
2010-05-17 15:34:37 yy.yy.yy.yy MPLPRPR05 SMTPSVC1 MPLWSPR03 10.0.10.13 0 RCPT - +TO:+<[email protected]> 250 0 37 35 0 SMTP - - - -
2010-05-17 15:34:37 xx.xx.xx.xx OutboundConnectionCommand SMTPSVC1 MPLWSPR03 - 25 RCPT - TO:<[email protected]> 0 0 4 0 125 SMTP - - - -
2010-05-17 15:34:37 xx.xx.xx.xx OutboundConnectionResponse SMTPSVC1 MPLWSPR03 - 25 - - [email protected]+ 0 0 35 0 172 SMTP - - - -

2010-05-17 15:34:37 xx.xx.xx.xx OutboundConnectionResponse SMTPSVC1 MPLWSPR03 - 25 - - 220+********************************************************************************************************** 0 0 110 0 31 SMTP - - - -
2010-05-17 15:34:37 xx.xx.xx.xx OutboundConnectionCommand SMTPSVC1 MPLWSPR03 - 25 EHLO - MPLWSPR03.domain.local 0 0 4 0 31 SMTP - - - -
2010-05-17 15:34:37 xx.xx.xx.xx OutboundConnectionResponse SMTPSVC1 MPLWSPR03 - 25 - - 250-domain.co.uk+Hello+[yy.yy.yy.yy] 0 0 37 0 78 SMTP - - - -
2010-05-17 15:34:37 xx.xx.xx.xx OutboundConnectionCommand SMTPSVC1 MPLWSPR03 - 25 MAIL - FROM:<[email protected]> 0 0 4 0 78 SMTP - - - -
2010-05-17 15:34:37 xx.xx.xx.xx OutboundConnectionResponse SMTPSVC1 MPLWSPR03 - 25 - - [email protected]+OK 0 0 48 0 125 SMTP - - - -
2010-05-17 15:34:37 xx.xx.xx.xx OutboundConnectionCommand SMTPSVC1 MPLWSPR03 - 25 RCPT - TO:<[email protected]> 0 0 4 0 125 SMTP - - - -
2010-05-17 15:34:37 xx.xx.xx.xx OutboundConnectionResponse SMTPSVC1 MPLWSPR03 - 25 - - [email protected]+ 0 0 35 0 172 SMTP - - - -
2010-05-17 15:34:37 xx.xx.xx.xx OutboundConnectionCommand SMTPSVC1 MPLWSPR03 - 25 DATA - - 0 0 4 0 172 SMTP - - - -
2010-05-17 15:34:37 xx.xx.xx.xx OutboundConnectionResponse SMTPSVC1 MPLWSPR03 - 25 - - 354+Start+mail+input;+end+with+<CRLF>.<CRLF> 0 0 44 0 219 SMTP - - - -
[B]2010-05-17 15:34:44 xx.xx.xx.xx OutboundConnectionResponse SMTPSVC1 MPLWSPR03 - 25 - - 250+2.6.0++<[email protected]>+Queued+mail+for+delivery 0 0 84 0 5953 SMTP - - - -[/B]
2010-05-17 15:34:44 xx.xx.xx.xx OutboundConnectionCommand SMTPSVC1 MPLWSPR03 - 25 QUIT - - 0 0 4 0 5969 SMTP - - - -
2010-05-17 15:34:44 xx.xx.xx.xx OutboundConnectionResponse SMTPSVC1 MPLWSPR03 - 25 - - 221+2.0.0+domain.co.uk+Service+closing+transmission+channel 0 0 57 0 6047 SMTP - - - -
*Ip addresses have been changed to protect the guilty ... I mean innocent.
Click to expand...



From the connect log it looks like (i think ) your server thinks there is no mail to be sent. The other server is simply ack'ing it.

Do any other accounts, users, exhibit this? If no it is local to the machine.


Ken
 

My Computer

Computer Manufacturer/Model Number
HP Pavillion dv-7 1005 Tx
OS
Win 8 Release candidate 8400
CPU
[email protected]
Memory
4 gigs
Graphics Card(s)
Nvidia 9600M
Sound Card
HD built-in
Monitor(s) Displays
17" Wxga
Screen Resolution
1440x900
Cooling
none
Internet Speed
45Mb down 5Mb up
Thank you for the reply zigzag3143 but he way this is set up there is only a single user that sends the emails but I have seen this message on multiple recipients. I think on one day we saw over 1,000 instances in the logs!

It's the target email server's IP address in the log file that's throwing me but surely if it was OWN machine it would show OUR IP - but on the other hand, are there really that many email servers that are queuing their messages from us?!
 

My Computer

Computer Manufacturer/Model Number
IBM / Lenovo
OS
windows / Linux - Depending on mood
CPU
3GHZ P4HT
Motherboard
IBM / Lenovo
Memory
1GB
Graphics Card(s)
NV6200
Sound Card
On-board - Soundmax
Monitor(s) Displays
32" Sony Bravia
Screen Resolution
1024/768
Hard Drives
40GB IDE / Make varies depending on OS as I build 1 HDD for each and swap at will.
PSU
Standard
Case
Standard
Cooling
Standard
Keyboard
Logitech Wireless EX110
Mouse
Logitech Wireless EX110
Internet Speed
20MB Cable
Other Info
Badgerlan has 9 machines - 5 servers & 4 clients; total disk space is about 6TB and increasing!!
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