Comcast.net email not sending messages

I switched to WOWAY internet this week. I am using my comcast.net email addresses with Outlook on 2 desktops, using Incoming server pop.comcast.net and Outgoing smtp.comcast.net. I have been using this setup with Xfinity for years. However, before I even quit Xfinity, but after WOW internet was installed, I had trouble sending emails:

I get the "0X800CC0F connection to the server is interrupted" sending error message, and the message sits in the Outbox. Worked on it all day, trying different suggestions from the internet and this forum, then in the evening it worked. The next morning, it didn't, and I got the same message. After reading some of the posts here and finding other people were having the same issue, but said it worked at a certain time in the evening, I tested it. Exactly at 7pm EST, I could send emails. In the morning I tried a little after 8 am and it still sent. Sometime before 9 am, it stopped and got the same error message.

Messages will send using the Xfinity email website (which I do not want to use). They will also send if I connect using my mobile hotspot.

Does anyone have a solution to fix this problem?

Responses

U

user_3e0e7d

Visitor

•

20 Messages

19 days ago

I don't know how to update this post except to comment: Same thing happened last evening-7pm my email would send. It worked this morning from 7:50am until at least 9:38. I couldn't test again until 11:19 and it is NOT sending anymore-stuck in Outbox.

7

0

XfinityJamesC

Official Employee

•

2K Messages

Greetings, @user_3e0e7d! I hope your week has been treating you well. Thanks so much for taking a moment out of your busy day to leave a post on our community forum. I'm sorry to hear you're having issues with your email, but you have definitely come to the right place for assistance.

Thank you for providing so many details to help describe what was happening. I'm happy to hear your email works when you log into the online web portal, but I know how important it is to get Outlook syncing properly as well. You mentioned the system works correctly when you connect using your mobile hotspot. This could be related to your network settings, somehow. If you originally set up your Outlook when you had Xfinity Internet Service, then switched to a different provider, there may be some lingering association with your IP address in Outlook or on your device. If you try to connect using a VPN, does it produce the same results as connecting to your mobile hotspot, by any chance?

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer. tick

Like

Reply

18 days ago

U

user_3e0e7d

Visitor

•

20 Messages

I am sorry- I am not used to this forum, so I just saw your response. I do not have a VPN, so haven't tried it.

Like

Reply

16 days ago

0

U

user_3e0e7d

Visitor

•

20 Messages

I forgot to say thank you for responding.

Like

Reply

16 days ago

0

XfinityAmandaB

Official Employee

•

1.9K Messages

Of course and no worries at all, and thank you for letting us know. It is odd there was that delay. You can test to see if it is resolved by sending yourself a message if you want to but if you are back to normal that is awesome. Also, we do offer a VPN with our advice security options that come with our Xfi complete feature, it is designed to be used on an outside network like a unsecured hotspot. If you are an Xfi complete customer you can check out more about our Advanced Security on the go here.

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer. tick

Like

Reply

16 days ago

0

U

user_3e0e7d

Visitor

•

20 Messages

I just sent an email, and it did send. However, it is during the time period from about 7pm EST to sometime the next morning when the SEND works. As I said in my question, it sends in the evening, and stops in the morning. When it sends, I get the error message 0X800CC0F and then the message sits in the outbox.

I will try again in the morning, but unless something has changed, I expect the same issue. I will update here.

Like

Reply

16 days ago

0

U

user_3e0e7d

Visitor

•

20 Messages

16 days ago

Update -This morning my email stopped sending by 8:45 am. I don't really know if it was working earlier, because I didn't try. But previously, it had stopped sending a little later in the morning, because I didn't attempt to send anything before that.

0

U

user_3e0e7d

Visitor

•

20 Messages

16 days ago

Update - This evening, one email which was sitting in my Outbox, sent at 7:05. I tried sending one afterwards - sometime before 8:00 and it won't send.

2

0

XfinityAmandaB

Official Employee

•

1.9K Messages

user_3e0e7d Thank you so much for the updates. Did you see the reply from @XfinityJamesC's above and have a chance to try a VPN with your connection?

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer. tick

Like

Reply

16 days ago

0

U

user_3e0e7d

Visitor

•

20 Messages

No I did not see it until now. I am not sure how the forum works. I do not have a VPN, so didn't try that. Also, since my recent update a little while ago, the email in my outbox sent.

Like

Reply

16 days ago

0

U

user_3e0e7d

Visitor

•

20 Messages

15 days ago

Update : Sent an email successfully at 7:37am today. At 8:36am , got error and it didn't send. Briefly displayed error "0x800ccc67 421 resomta - C2p5555954 sys.comcast.net

excessive failed authentication ESMTP server temporarily not available".

Then it displayed the usual 0X800CC0F error. It is now sitting in my outbox.

7

0

XfinityJamesC

Official Employee

•

2K Messages

Thank you for the update, @user_3e0e7d. It definitely sounds like there is some sort of server connection issue. Have you had a chance to read through the post my colleague shared last night (https://forums.xfinity.com/conversations/email/cannot-send-email-0x800ccc0f-connection-to-server-interrupted-or-0x800ccc67-esmtp-server-temporarily-not-available-message/61b28270f06968168603033a)? It sounds like there were a few users experience the same issue, and our CSA representative and some of our community Experts were able to offer some helpful info to help correct things.

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer. tick

Like

Reply

15 days ago

0

U

user_3e0e7d

Visitor

•

20 Messages

When I go to the link you provided, all I see are messages from 3 years ago. It's obvious people were and are having the same problem-with different providers. What we all have in common is the fact that sending emails work only during certain hours.

I do not think I am technically skilled enough to go into my router's setting and change the DNS address or whatever it was someone did that said it worked for a while.

Like

Reply

15 days ago

0

XfinityBradM

Official Employee

•

829 Messages

To confirm, are you receiving any sort of error when attempting to send the messages through the web client?

(edited)

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer. tick

Like

Reply

15 days ago

0

U

user_3e0e7d

Visitor

•

20 Messages

I am not receiving any error using the web email.

Like

Reply

15 days ago

0

XfinityBradM

Official Employee

•

829 Messages

If you're having difficulties sending messages through your 3rd party email apps, we would have you reach out to their support as you've confirmed you're able to send emails through the web client that we have access to supporting. With the apps only working intermittently, you can jump into the web client to send time sensitive emails when necessary.

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer. tick

Like

Reply

15 days ago

0

BruceW

Gold Problem Solver

•

26.2K Messages

15 days ago

... excessive failed authentication ...

Please see https://forums.xfinity.com/conversations/email/65a1a8fbf961c6163a367c6f.

Please be aware that there are 2 kinds of responses in this Forum: Replies and Comments. When you Comment on a post by scrolling down to "Comment on this post here...", I am notified of your response. But if you select Reply, I am NOT notified and may not be aware of your response.

0

U

user_3e0e7d

Visitor

•

20 Messages

15 days ago

Thank you for your response. I just did this, and it did not work. The triggering point for this to stop working is I switched internet providers.

And also, it does work at certain times of the day.

Thanks for straightening out how comments and replies work. It's counterintuitive to me. Also I am set up to receive notification from this forum when someone responds, and yours

is the first I got a notification for.

(edited)

0

U

user_3e0e7d

Visitor

•

20 Messages

14 days ago

Update-I figured out how to log what is happening in Outlook when it tries to send an email. I am posting a portion of this log in hopes it will give someone a clue as to what is happening , even though it is an Outlook log. I can't interpret exactly what is happening, but can see that something different happens at 7 pm.

I started the log shortly before 7pm tonight when my emails were still not sending, so it shows what's happening then - it gets the -x800xxx0f error. Then you can see what happens at 7pm, when I press send and receive. It connects and gets a "resomta" message and does some other things and sends the email. I am not doing anything to delay email until 7pm in case that is what someone thinks. Please can someone look and see if this log helps?

2025.02.07 18:59:50 [Edited: "Personal Information"]: ReportStatus: RSF_COMPLETED, hr = 0x800ccc0f
2025.02.07 18:59:50 SMTP (smtp.comcast.net): Port: 465, Secure: SSL, SPA: no
2025.02.07 18:59:50 SMTP (smtp.comcast.net): Finding host
2025.02.07 18:59:50 SMTP (smtp.comcast.net): Securing connection
2025.02.07 18:59:50 SMTP (smtp.comcast.net): Connected to host
2025.02.07 18:59:50 SMTP (smtp.comcast.net): Disconnected from host
2025.02.07 18:59:50 SMTP (smtp.comcast.net): End execution
2025.02.07 18:59:50 [Edited: "Personal Information"]: ReportStatus: RSF_COMPLETED, hr = 0x800ccc0f
2025.02.07 18:59:50 [Edited: "Personal Information"]: Synch operation completed
2025.02.07 19:00:45 [Edited: "Personal Information"]: Synch operation started (flags = 00000001)
2025.02.07 19:00:45 [Edited: "Personal Information"]: UploadItems: 3 messages to send
2025.02.07 19:00:45 SMTP (smtp.comcast.net): Begin execution
2025.02.07 19:00:45 SMTP (smtp.comcast.net): Port: 465, Secure: SSL, SPA: no
2025.02.07 19:00:45 SMTP (smtp.comcast.net): Finding host
2025.02.07 19:00:45 SMTP (smtp.comcast.net): Connecting to host
2025.02.07 19:00:45 SMTP (smtp.comcast.net): Securing connection
2025.02.07 19:00:45 SMTP (smtp.comcast.net): Connected to host
2025.02.07 19:00:46 SMTP (smtp.comcast.net): <rx> 220 resomta-a2p-647345.sys.comcast.net resomta-a2p-647345.sys.comcast.net ESMTP server ready
2025.02.07 19:00:46 SMTP (smtp.comcast.net): [tx] EHLO DESKTOP0DLHO6G
2025.02.07 19:00:46 SMTP (smtp.comcast.net): <rx> 250-resomta-a2p-647345.sys.comcast.net hello [67.149.254.4], pleased to meet you
2025.02.07 19:00:46 SMTP (smtp.comcast.net): <rx> 250-HELP
2025.02.07 19:00:46 SMTP (smtp.comcast.net): <rx> 250-AUTH LOGIN PLAIN XOAUTH2
2025.02.07 19:00:46 SMTP (smtp.comcast.net): <rx> 250-SIZE 36700160
2025.02.07 19:00:46 SMTP (smtp.comcast.net): <rx> 250-ENHANCEDSTATUSCODES
2025.02.07 19:00:46 SMTP (smtp.comcast.net): <rx> 250-8BITMIME
2025.02.07 19:00:46 SMTP (smtp.comcast.net): <rx> 250 OK
2025.02.07 19:00:46 SMTP (smtp.comcast.net): Authorizing to server
2025.02.07 19:00:46 SMTP (smtp.comcast.net): [tx] AUTH LOGIN
2025.02.07 19:00:46 SMTP (smtp.comcast.net): <rx> 334 VXNlcm5hbWU6
2025.02.07 19:00:46 SMTP (smtp.comcast.net): [tx] cGxoZXJtQGNvbWNhc3QubmV0
2025.02.07 19:00:46 SMTP (smtp.comcast.net): <rx> 334 UGFzc3dvcmQ6
2025.02.07 19:00:46 SMTP (smtp.comcast.net): [tx] *****
2025.02.07 19:00:46 SMTP (smtp.comcast.net): <rx> 235 2.7.0 ... Authentication succeeded
2025.02.07 19:00:46 SMTP (smtp.comcast.net): Authorized to host
2025.02.07 19:00:46 SMTP (smtp.comcast.net): Connected to host
2025.02.07 19:00:46 SMTP (smtp.comcast.net): [tx] MAIL FROM: <*****>
2025.02.07 19:00:48 SMTP (smtp.comcast.net): <rx> 250 2.1.0 <*****> sender ok
2025.02.07 19:00:48 SMTP (smtp.comcast.net): [tx] RCPT TO: <*****>
2025.02.07 19:00:50 SMTP (smtp.comcast.net): <rx> 250 2.1.5 <*****> recipient ok
2025.02.07 19:00:50 SMTP (smtp.comcast.net): [tx] DATA
2025.02.07 19:00:51 SMTP (smtp.comcast.net): <rx> 354 OK
2025.02.07 19:00:51 SMTP (smtp.comcast.net): [tx]
.
2

(edited)

0

U

user_3e0e7d

Visitor

•

20 Messages

10 days ago

I am still having the same sending problem. Will send exactly at 7pm EST, stops sending sometime the next morning. Today I could send until 9am or so. I posted a log from Outlook in a comment to my original post, hope that an Xfinity employee would look at it to see if it gives a clue as to what's happening. I am trying to keep my issue active-and I am hoping a comment from time to time does that.

1

0

XfinityAlex

Official Employee

•

895 Messages

@user_3e0e7d As noted above, please send me a DM with your UID (and IP if you have it). I'll take a look at the detailed logs the MTAs provide

Like

Reply

10 days ago

0

BruceW

Gold Problem Solver

•

26.2K Messages

10 days ago

I am still having the same sending problem ...

Your best be is to send a DM to @XfinityAlex as suggested in their post yesterday morning (see above):

@user_3e0e7d Could you DM me your email address you're using? I'll look at the logs and try to see if we can get you some additional information.

Usually this is a device in your network that has incorrect credentials.

Please be aware that there are 2 kinds of responses in this Forum: Replies and Comments. When you Comment on a post by scrolling down to "Comment on this post here...", I am notified of your response. But if you select Reply, I am NOT notified and may not be aware of your response.

0

U

user_3e0e7d

Visitor

•

20 Messages

10 days ago

Thank you BruceW for your response. I did not see anything from XfinityAlex until you mentioned it, and that was from this morning after my comment.

I appreciate that you are paying attention and taking the time to respond.

0

U

user_f77dzp

4 Messages

4 days ago

I am having problems with sending my comcast.net emails. My wife and I each have a comcast.net email, and in the last month or so we can receive but not send. This is true for my wife on both her iPhone using the native Apple iPhone mail app, and on her Windows-11 pc using Microsoft 365 Classic Outlook. Likewise for me on my iPhone and pc. However, when I go to my web browser on my pc and open the comcast.net/xfinity email program there, It works! I see all my folder structure, etc. Why not in Outlook or on the iPhones? Ans especially with two independent email accounts? Spent hours trying to talk with Comcast support, with no success. Today I looked here in these support forum comments, and see some people have had similar problems and found out their sending problems were due to Comcast blocking their accounts, and the Support Tech was able to unblock it to fix it. Hope Comcast Support can help me?

2

U

user_3e0e7d

Visitor

•

20 Messages

Mine is still not working. I do not know if "unblocking" is a solution for me. It seems something on my end is attempting connect to the outgoing mail server without proper credentials, which Xfinity blocks after a certain number of attempts, then frees up again at 7:pm. Been working with a support tech and still have not been able to figure it out, but he has made a real attempt to help. It just happened to start without any other changes except using an internet provider that is not Xfinity.

Like

Reply

4 days ago

0

XfinityGabriel

Official Employee

•

2.1K Messages

user_3e0e7d, Thanks for reaching back out and for letting us know. To provide our customers with additional security, we added a new checkbox to the Xfinity Email website. This may affect your ability to manage your Xfinity Email (Comcast.net) through a third-party program such as Outlook. The security setting is checked by default. You can easily change this setting at any time by checking the box and turning on access. Would you mind trying the steps blow to see if you expernice the same issue. Please let us know if this helps.

Sign in to Xfinity Email using your Xfinity ID and password.
In the top-right corner, click the Gear icon, then select Settings.
Click Security.
Check the box under Third Party Access Security to allow third-party programs access to your Xfinity Email.

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer. tick

Like

Reply

2 days ago

0

Email

user_3e0e7d

Comcast.net email not sending messages

Was this helpful?

user_3e0e7d

XfinityJamesC

user_3e0e7d

user_3e0e7d

XfinityAmandaB

user_3e0e7d

user_3e0e7d

user_3e0e7d

XfinityAmandaB

user_3e0e7d

user_3e0e7d

XfinityJamesC

user_3e0e7d

XfinityBradM

user_3e0e7d

XfinityBradM

BruceW

Please be aware that there are 2 kinds of responses in this Forum: Replies and Comments. When you Comment on a post by scrolling down to "Comment on this post here...", I am notified of your response. But if you select Reply, I am NOT notified and may not be aware of your response.

user_3e0e7d

user_3e0e7d

user_3e0e7d

XfinityAlex

BruceW

Please be aware that there are 2 kinds of responses in this Forum: Replies and Comments. When you Comment on a post by scrolling down to "Comment on this post here...", I am notified of your response. But if you select Reply, I am NOT notified and may not be aware of your response.

user_3e0e7d

user_f77dzp

user_3e0e7d

XfinityGabriel

New to the Community?