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Check if our Firewall is Blocking Port 587 for SMTP Mail

Posted on 2011-09-15
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Last Modified: 2012-05-12
Hello

Our Hosted Exchange service provider has just migrated our accounts with them from older exchanger server to new 2010 exchange system.. we are all geting our emails..but we have to change our SMTP settings from port 25 to port 587 plus a new address.. I am not able to get anything that required SMTP to work (such as Backup Exec Notifications and Sharp printer Scanning to email) and I need to know if our Netgear FVS338 Firewall/VPN router is blocking it. I can not see anything obvious in the settings. Though Outbound All appears to be allowed.. Wondering if there is a Port tester or tool that I could run to see if the Port is the issue?
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Question by:CATHY-IT
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wulfhere earned 125 total points
ID: 36543834
If you're having problems with outbound connections on port 25, you can use a tool like Angry IP Scanner (http://www.angryip.org) or NMAP (http://nmap.org/) to scan to see if you can access port 25 on your hosted exchange server (although you may want to notify your provider BEFORE doing a port scan!).

Alternatively, you can also attempt to telnet to your exchange server on port 25 from a command line like this: telnet [server hostname or IP] 25. If you get a response like this:

Trying XXX.XXX.XXX.XXX...
Connected to XXX.XXX.com.
Escape character is '^]'.
220 XXX.XXX.com

Then you successfully connected, and its probably not your firewall.
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by:CATHY-IT
ID: 36543878
I assume this would be the same test for Port 587.. they changed from using 25 to now using 587.. this is what caused the problem.. we were working find before they migrated us
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by:CATHY-IT
ID: 36543944
i received a 200 mailserver address Microsoft ESMTP mail service ready at Thursday Sept 15, 2011 12:03pm -0400

so does that mean I have communication with the SMTP Server?
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Author Comment

by:CATHY-IT
ID: 36543979
PS.. Its sitting there in a telnet session waiting for commands I believe.
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by:CATHY-IT
ID: 36544131
From what I can tell..I'm communicating via Telnet with the server. So why am i not able to send SMTP server?
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by:wulfhere
ID: 36544506
Yes, Cathy, that '200 <address> Microsoft ESMTP mail service ready' prompt means that you successfully connected to your Exchange server's SMTP port. I'm assuming that you used 587 instead of 25 when you ran that telnet command?

What I suspect is going on is that your devices (i.e. your printer and backup software) are sending email via port 25 instead of 587. I'm not familiar with either of those products, but they probably have a setting somewhere that allows you to set up the port they connect to.

If that doesn't resolve it (or if you can't configure those devices to use a port other than 25 for SMTP traffic), you may have to ask your Exchange provider to allow SMTP connections to them on port 25.

--
Tim
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Author Comment

by:CATHY-IT
ID: 36544786
Yes, I did you port 587 when I telnet...and  You are right.. I have changed the Ports from 25 to 587 in both applications with no luck.. I'm at lost of what more I can do.. very fustrating.. and of course our service provider is totally bogged since they had migrated several of their clients last night. Thanks
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Author Comment

by:CATHY-IT
ID: 36545213
Think we got for the Sharp Multi-function, it was that the SSL option had to be turned on for the Sharp printer, but looks like Backup Exec Ver 12.5 doesn't have that options in the screen to setup SMTP, anyone have any ideas about it?
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Author Comment

by:CATHY-IT
ID: 36550144
I got it working.. I just used an SMTP server that is for non Exchange Users to by pass the other one for notifications from Symantec Server software... works fine.. thanks.. Not sure how I should be allocating this??
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Expert Comment

by:wulfhere
ID: 36550474
Glad to hear you got the printer working! I don't have any experience with Backup Exec. You might still need to talk to your Exchange provider, and see if they can either open up port 25, or remove the SSL option.
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