Visitor
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2 Messages
Residential use of home mail server blocked on port 25
https://corporate.comcast.com/comcast-voices/updated-management-of-smtp-port-25
Upon request to our Customer Security Assurance team this block can be removed, enabling access to use port 25 for other email domains, though the comcast.net email servers will no longer accept submission via port 25.
I spoke with the CSA team, as well as Techincal support, Advanced Repairs, and a sales person for Business Internet, and none had a clue what I was talking about.
I want to run a personal mail server at home, which requires port 25 is unblocked. I've confirmed that both inbound and outbound traffic on that port is blocked within the comcast netowrk.
flatlander3
Problem Solver
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1.5K Messages
2 years ago
Cheap advice?
You can get them to remove the port 25 block on a residential account if you pester them enough in some cases. The problems? You are coming from a cable company DHCP pool. Anyone running a legit hosting/email/spam blocking service will block your email. Also, anytime your IP address changes, you'll have the same issue and you'll be doing this again.
Alternates? Find a hosting provider and run a VPS or lease rack space at a reputable company (check the spam reputation of the provider's IP blocks first), if you want to run the mail server. Some are better than others. Prices vary.
There are port redirect services that are cheap. Change your DNS MX record to their server, and they can relay mail to your Xfinity IP address to the port of your choice that isn't blocked. Run your SMTP server on another port. You'll still have a down time problem when your IP address changes, but DNS propagation usually isn't so bad if you control the expire time and notify at the register service. They'll also cache mail for you when that happens. Send your outbound mail through Xfinity's mail server on port 587.
There is also comast business if you want full control. Then you don't have the DHCP pool problem and a legit static IP address, and less chance of people blocking your email: https://business.comcast.com/
If you don't want to manage the email server, domain name registers can also handle email for you.
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EG
Expert
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110K Messages
2 years ago
Concern moved here to the proper help section for assistance............................
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XfinityEva
Official Employee
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1.6K Messages
2 years ago
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user_782406
Visitor
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2 Messages
2 years ago
I'm not talking about connecting to Comcast's mail servers via SMTP on port 25.
I need the Comcast network to stop blocking port 25 to my address so I can receive mail to my personal mail server
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