Re: telnet to smtp mail server Q

Dean Wed, 10 Apr 2013 12:13:45 -0700

FYI, you CAN get this unblocked if you talk to the right people.

http://corporate.comcast.com/comcast-voices/taking-steps-to-prevent-unintentional-network-abuse
http://corporate.comcast.com/comcast-voices/updated-management-of-smtp-port-25

On 4/10/2013 12:53 PM, Jimmy Tran wrote:

Yep, that is the answer. Just wanted to make sure I wasn’t going crazy.

Thanks!

From: Jonathan Link [mailto:[email protected]]
Sent: Wednesday, April 10, 2013 10:29 AM
To: MS-Exchange Admin Issues
Subject: Re: telnet to smtp mail server Q

Because Comcast blocks port 25...

On Wed, Apr 10, 2013 at 1:17 PM, Jimmy Tran <[email protected]> wrote:

I am testing this from my home network which is Comcast to my office. I don’t use port 587, only 25. From inside my office I can telnet to my internal exchange ip fine. If I use the public ip it will fail due to some NAT polices I haven’t configured yet which is why I’m trying from home and other locations besides my office network.

I still don’t know why email comes in on port 25 from other email servers but I cannot connect through a telnet session. McAfee or any other similar software is not installed on the machine.

From: Steve Hart [mailto:[email protected]]
Sent: Wednesday, April 10, 2013 9:30 AM

To: MS-Exchange Admin Issues
Subject: RE: telnet to smtp mail server Q

There may be a firewall rule on your network preventing outbound port 25 connections from everything but your mail servers. That’s a common rule to stop spambots on internal networks from getting out.

Steve

Steve Hart

Network Administrator

503.491.4343 -Direct | 503.492.8160 - Fax

From: Jimmy Tran [mailto:[email protected]]
Sent: Wednesday, April 10, 2013 12:51 AM
To: MS-Exchange Admin Issues
Subject: RE: telnet to smtp mail server Q

No Mcafee. Just Microsoft security essentials

Sent from my Android phone using TouchDown (www.nitrodesk.com)

-----Original Message-----
From: Liby Philip Mathew [[email protected]]
Received: Wednesday, 10 Apr 2013, 12:49am
To: MS-Exchange Admin Issues [[email protected]]
Subject: RE: telnet to smtp mail server Q

Are you using McAfee on the PC? If so, probably it is blocking port 25. Just a thought.

Regards

Liby Philip Mathew | Principal Systems Administrator

ICT Professional Services

Path Solutions

Tel: +965 24824600 Ext. 703

Fax: +965 24824500

www.path-solutions.com

From: Jimmy Tran [mailto:[email protected]]
Sent: Wednesday, April 10, 2013 09:39
To: MS-Exchange Admin Issues
Subject: telnet to smtp mail server Q

Im having a brain fart right now. I’m trying to telnet to a smtp server from outside of that network on port 25 but I get a connection refused. When I send an email from outside to that domain, the mail goes through to the recipient.

Why can’t I telnet in on port 25? What am I missing? I’m making sure I telnet to the mx record on port 25 from outside and no go….

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Re: telnet to smtp mail server Q

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