New Contributor
•
3 Messages
Emails to comcast.net addresses throttled
I run an email server behind a static IP address associated with a Comcast Business Internet account. This server has been running behind this address for over 6 years. When sending emails to comcast.net addresses lately, they are being delayed, and I'm seeing the following message returned from Comcast's server:
421 4.2.0 x.x.x.x throttled - try again later. please see http://postmaster.comcast.net/smtp-error-codes.php#rl000001
Where x.x.x.x is our static IP address.
Our SenderScore is 0. We are a small business, and do not send any type of marketing emails. According to the link above, we should be able to send 1,200 messages per hour with a Sender Score of 0. We don't even send that many emails in a month! This issues usually occurs when an email is sent to the same group of people, with around 4 having comcast.net addresses. Emails to comcast.net addresses are not sent every day, and may only be sent a few times per day.
We do not have any issues sending emails to any other domains, including yahoo.com, outlook.com and gmail.com, the issue is only with comcast.net addresses.
I suspect the issue is with the flawed Sender Score system. We have a low score because we don't have the volume of a large corporation, not because we send spam. We shouldn't be throttled for that reason!
I've called the Comcast Customer Security Assurance 4 times now, but they have not been very helpful. Can anyone else from Comcast assist with getting our IP address whitelisted, so we can send emails to comcast.net addresses without an issue?
Thank you
Comcast_Gabriel
Official Employee
•
313 Messages
5 years ago
Hi! Thanks for reaching out over our forums page. I am sorry to learn about the issue you're experiencing with sending emails to https://comca.st/3m63KQa addresses. This is definitely not the experience we like to hear about. I can understand how important it is to be able to send emails without any issues for your business. We can certainly help. To research this further, would you mind sending us a private message with your name, address, and account number by clicking the "message" icon in the upper right page of any forum page? Once you click on that, input our shared handle Comcast Business to send us a private message.
0
0
user_da1b61
New Contributor
•
1 Message
4 years ago
We are having the same problem. We are trying to send just 5 emails and they just keep getting sent back to the email server with a message that the emails are being throttled. We normally probable send 20 emails to people at comcast.net a month. Can someone there please help. I have filled out the blacklist form but the answer is that we are NOT being blacklisted. Yet the emails sit in our queue with the throttled message. My email address is: tsg@cctg.com if you need to contact me directly. Thank you for your help.
1
0
user_b8188e
New Contributor
•
3 Messages
4 years ago
Comcast has been no help with this issue, and it has not been resolved for me. Each time I called the Comcast Customer Security Assurance, the issue was supposed to be escalated, but I still have not heard back from anyone.
I had the same result with the blacklist form.
0
0
user_b8188e
New Contributor
•
3 Messages
4 years ago
I also sent a private message, as Gabe suggested, but that team seemed to be even less knowledgeable than the Comcast Customer Security Assurance. They said they were opening a case, but I never heard back on that case either.
1
0
user_248146
New Contributor
•
1 Message
3 years ago
I'm having the same problem, with this message
host mx2h1.comcast.net[96.102.157.179] said: 421 4.1.0 [IP address] Throttled - try again later. Please see http://postmaster.comcast.net/smtp-error-codes.php#RL000001
1
0
ROEBC
New Contributor
•
2 Messages
3 years ago
we are getting
Reason: [{LED=421 4.2.0 40.107.95.126 Throttled - try again later. Please see https://postmaster.comcast.net/smtp-error-codes.php#RL000003};{MSG=};{FQDN=mx2a1.COMCAST.NET};{IP=96.103.145.164};{LRT=12/19/2022 4:07:38 PM}]. OutboundProxyTargetIP: 96.103.145.164. OutboundProxyTargetHostName: mx2a1.COMCAST.NET
for emails sent out to our distribution list members who are comcast subscribers.
3
0
user_fe370c
New Contributor
•
2 Messages
21 days ago
My server send approx 20 emails to comcast a week. My IP is no on any spam lists and my email is being throttled for almost 2 months now. I have submitted the block list form at least 5-6 times and no one has responded. any email in the server que get the same message, but then is returned and never delivered.
There are at least 10 domains having this issue, from the same IP and other from IPS in the same subnet. Is there any way to get this rectified? The comcast email I'm sending to is mine and I never receive the message, the server just shows the error below until the email is finally returned to my sending account.
Recipients: [Edited: "Personal Information"];3;2;[{LED=421 4.1.0 216.58.163.163 Throttled - try again later. Please see https://postmaster.comcast.net/smtp-error-codes.php#RL000003};{MSG=};{FQDN=};{IP=};{LRT=}];0;CN=Outbound,CN=Connections,CN=Exchange Routing Group (DWBGZMFD01QNBJR),CN=Routing Groups,CN=Exchange Administrative Group (FYDIBOHF23SPDLT),CN=Administrative Groups,CN=First Organization,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=XXX,DC=XX;0
(edited)
3
0