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9 Messages
Non-Delivery of email from our server on a Comcast Business IP
The entire Comcast Business network (96.64.0.0/11) is listed on UCEPROTECTL2 and other ISPs are blocking our legit email even though our mail server IP has never been individually listed.
Our employees are not getting important messages sent through the SMTP to SMS gateway, and this is alienating numerous customers as orders are not delivered.
I do not recommend Comcast Business for any business customer that needs reliable email delivery. Comcast ignores spam/abuse reports and allows spammers to continue sending UCE through the Comcast network. Innocent customers are then punished when other ISPs block the entire Comcast class B subnet,as is the case now. And since the spam level is increasing, there is no end to the blocking in sight (see below).
@Comcast_JustinC: The reporting URL you posted above (https://spa.xfinity.com/ ) is useless in this case. The drop down menu does not have an option to report delivery problems SENDING mail from a Comcast IP, only for sending mail TO a Comcast.net customer.
Emails to abuse@comcast.net go unanswered, as more and more spam is being allowed.
[Edited: "Solicitation"]
UCEPROTECT-Level2
Networks this IP belongs to
| Networks | Status | Level 1 listed abusers within the last 7 days |
Impacts in this net within the last 7 days |
Level 2 Escalation limit by Impacts |
Optional express delisting WARNING! PROBLEM MUST BE FIXED FIRST TO PREVENT NEW LISTINGS |
|
|---|---|---|---|---|---|---|
  96.64.0.0/11 |
LISTED |
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Reputation of ASN 7922 | COMCAST-7922, US
| AS | Status | Spamscore | Provider has total IP's |
Level 1 listed abusers within the last 7 days |
Impacts from Level 1 | Level 3 Escalation limit by Impacts | Optional express delisting WARNING! PROBLEM MUST BE FIXED FIRST TO PREVENT NEW LISTINGS |
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|---|---|---|---|---|---|---|---|---|---|---|---|
| 7922 | WARNING High Listingrisk |
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DETAILS ABOUT ALL ABUSER IP's LISTED IN LEVEL 1 AND THEIR IMPACTS CAN BE FOUND HERE!
Link of this Query: http://www.uceprotect.net/en/rblcheck.php?ipr=96.64.0.0
[NOTE: I have reported this on the extisting threads below but there has been no response. One of those threads is marked "Official Solution" even though the OP's last reply states that the problem is NOT resolved.
flybynight
New problem solver
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74 Messages
6 months ago
E-mail delivery has become more and more of a hassle in general, not just for Comcast customers. I have been running a mail server "forever" from my business Comcast account and I am also in a UCE-listed block (70.88.0.0/14). Here are a few tricks that helped so far maintain reasonable e-mail delivery:
- Make sure the IP address you use for your mail server has a proper reverse DNS configuration. For example, "mail.example.com," not "something.hfc.comcastbusiness.net." Forward and reverse DNS must match.
- Use DKIM, SPF, and DMARC. I find most major e-mail providers (Google, Microsoft, Yahoo) will reject email that does not use DKIM, if it comes from a "suspect" IP address range.
Worst case: Relay your e-mail through an "acceptable" email provider or keep a mail server at a cloud provider to relay email. This will save you money as you will not need static IPs and a Comcast-provided modem. You can switch to a faster/cheaper consumer account instead of a business account.
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