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Sending mail out with comcast isp

Posted on 2012-12-21
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I'm trying to set up a home network with an email server as well.
 
Lynksys Wireless 300N gateway router.
Winserv 2008 smtp enabled, firewall diabled
No Exchange installed yet

Comcast blocks port 25 and they use port 465 for incoming and 995 for outgoing. In the router, on the single port forwarding page, I set "External Port" to 995 and "Internal Port" to 465, and then set it to forward to my winserver 2008 with smtp enabled (no Exchange server installed). I use canuseeme.org to see if the outside world can see the opened ports. It can see port 80, which I also opened up, but I cannot see port 25, 465, or 995

Anybody have any experience setting up an email server when you have a comcast isp? I don't even need incoming mail, I have a Sharepoint site using port 80 and All I want is to be able to send email alerts to addresses outside of my network.
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Question by:BobHavertyComh
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by:s3e3
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For Outbound Email:
What you want to do is relay all your mail to your ISP's SMTP server. You will need to enter the authentication information (your comcast email username and password) into the windows 2008 SMTP server and select the relay host (your isp smtp server)

I am doing this with another ISP but the procedure for any ISP is the same.

Does comcast block incoming port 25 ? If they do you are stuck on the inbound side unfortunately.
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by:BobHavertyComh
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Yes they block 25, but they told me I could use 465 for incoming and 995 for outgoing. The problem is that even after opening these ports on my gateway router and disabling windows firewall, I have used canuseeme.org and it tells me it can see port 80, which i also opened up, but it can't see 465 or 995, so it doesn't look like anything's going to happen until those ports are showing as opened.

Are you saying that if I merely relay the mail from my smtp server to their mail server with my account credentials, I don't need to bother to have these ports opened?
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s3e3 earned 500 total points
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Since Comcast blocks inbound port 25 you will not be able to receive email from any mail server on the internet. All mail servers use SMTP port 25 to send mail, if this port is closed the sending server will fail.

On the outbound side (from your home network) you can use your own SMTP server which can be setup to relay outbound messages to your ISP's SMTP server using your Comcast SMTP credentials. If you do this you will not need any inbound ports open just outbound ports which I assume and home router already have open.

The outbound SMTP is no different than the settings for your comcast email client. All you are doing is pointing your internal email client software to your microsoft SMTP server which then relays all mail to comcast using the SSL/Authentication.
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by:BobHavertyComh
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Thanks for the extra clarification
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