IIS 5 & IIS 6
Messages stuck in mailroot/queue folder
Last post Jun 26, 2020 09:02 AM by Jalpa Panchal
Jun 23, 2020 08:46 PM|twestfall|LINK
I have a virtual SMTP server setup that has been running for months without a problem. It's acting as a relay to send messages to smtp.mandrillapp.com. Suddenly, on 6/10 it just stopped working. After tons of troubleshooting nothing seemed to fix it.
Many have said to try and telnet into the smtp.mandrillapp.com which I cannot do, but I can telnet from every other computer we have. Then on 6/15 about 1/2 way through the day, it just started sending again. Crazy... What happened? What changed? I never
did figure it out. Well, who cares right, it works now...
Then, just yesterday, it quit again. And once again, I can't get it going. I tried using a tool I found called SMTP Diag Tool. When I connect to that local SMTP server it appears to send just fine, however, it's still stuck in the queue folder. When
I tried to use that tool from that server to connect directly with smtp.mandrillapp.com it did not work. The log from tool just says
Connecting to mail server.
Failed to send message
I tried that same tool on a Windows 10 PC and it worked perfectly.
Any ideas of what I can check?
Jun 24, 2020 02:56 AM|Jalpa Panchal|LINK
could you please share On which OS this issue happen? you could try below setting to resolve the issue:
SMTP Virtual Server > Properties > Delievery > Outbound Connections->uncheck the option for Limit number of connections.
restart the SMTP service.
Jun 24, 2020 01:33 PM|twestfall|LINK
This is a Windows 2016 Standard Edition server.
And, I did try that fix you recommended but that didn't work either.
Yesterday after I posted this question, about an hour later the emails just started to release again. Right now it appears to be working fine but I wonder for how long?
Jun 26, 2020 09:02 AM|Jalpa Panchal|LINK
sometimes mail server banned some action due to this cause it is stuck in queue after restarting server or SMTP service will resolve the issue.