Emails bounce back- TalkTalk using blocked IP address

[Sheepdog2020]

I've been having problems sending emails. Some get through. Some are bounced back with the following: 

SMTP error from remote server for MAIL FROM command, host: hotmail-com.olc.protection.outlook.com (52.101.137.1) reason: 550 5.7.1 Unfortunately, messages from [74.208.4.196] weren't sent.

Please contact your Internet service provider since part of their network is

on our block list (S3140). You can also refer your provider to http:/
/mail.live.com/mail/troubleshooting.aspx#errors. [Name=Protocol Filter
Agent][AGT=PFA][MxId=11BC109457B31825] [SG2PEPF000B66CF.apcprd03.prod
.outlook.com 2025-10-16T10:06:15.882Z 08DE084A32D388F2]"

[nambuso-TT]

Thank you very much for providing us with the above information and Iyou are correct. Should you require any further assistance, please do not hesitate to contact us. Thank you very much for contacting TalkTalk. Have yourself a lovely day.

Goodbye

[Sheepdog2020 · Accepted solution]

Sorry I've been quiet for a few days, folks.

And sorry that I was a bit dim.

In my defense, the mssage from the server that blocked the email I'd sent...

"Please contact your Internet service provider since part of their network is

on our block list.."

... was not accurate. I am now guessing the problem had nothing to do with my ISP (TalkTalk). Is there a way to revise the thread's title? If it takes a sys op, I'd like it to be...

"Emails bounce back- blocked IP address- error message misleading"

------
Anyway... here's my current guess...

When I send an email, I use my TalkTalk connection to the internet to send the to a SMTP server. The SMTP takes care of sending the email on to the intended recipient. I am presuming that it is THAT server which used a blocked IP address. 

I should mention that using SMTP is probably unusual, at least among home users. If you do your email by simply opening a webpage with a browser, you are probably NOT using SMTP. (I.e. the problem I had... not of TalkTalk's making, anyway!.. is not likely to arise for you.)

If the above makes sense, and seems a likely explanation, please accept my apologies for taking this to the wrong forum. Maybe give it a "like" vote? If you think I'm STILL confused, advice would be welcome, of course.

____
Where did my email address come from? I created it from within the web-hosting contract I pay one of the big hosting firms for. I wanted "@wywtk.com" to go along with with my web-pages at https://wywtk.com

(I'll try to mark the thread "solved" in a few days if no one suggests I'm still confused.)

[nambuso-TT]

No worries:) Thanks for the support @fr8ys 

[fr8ys]

@nambuso-TT thanks for clarifying.

Unless @Sheepdog2020 responds there is nothing to be done.

Apologies for jumping in. It just seemed strange to me that it's also an acronym.

[nambuso-TT]

@fr8ys It is the same as the one provided by the customer above. 

[fr8ys]

@nambuso-TT have you checked the email address in private notes? Is it a TalkTalk or legacy address or a non supported one?

[nambuso-TT]

Thanks for advising @fr8ys 

[fr8ys]

@Sheepdog2020 can you clarify something please?

Wywtk is an acronym for what you wish to know. Are you using this to advise @amahle-TT that this information is now in your private notes field?

If so please post again and confirm the part of your email after the @. 

It may be that @amahle-TT did check the private notes field in your profile and found it a non TalkTalk email address, but the wywtk acronym doesn't make this clear and I can't find a provider that uses this as an email address.

Thank you.

[amahle-TT]

Unfortunately, we don't provide support for any email services provided by your previous ISP (Internet Service Provider).

Please contact their email support team for further assistance, thanks.

[Sheepdog2020]

Last part of eddress, bit after "@": wywtk.com

Many apologies for the extra "20" which somehow crept into my eddress as given (until a moment ago!) in my Personal Notes

[amahle-TT]

Could you please tell me the last part of your email address? This is the section after the @ symbol.

[Sheepdog2020]

You asked "What device are you using when accessing your email?"....

It is a Windows 10 laptop.

The emails that get bounced are sent by Thunderbird 143.0, using SMTP.

[amahle-TT]

We are sorry for this inconvenience; I need to know what device are you using when accessing your email?

[Sheepdog2020]

Sorry... I went out immediately after previous post.

My connection has "always" been stable. (Your records may show my WI-FI problems... but everything connected with the emails bouncing back has been on a laptop connected to my router via a cable. In any case... the bounce back suggests that my message got through to the destination server normally, doesn't it? (The bounce backs are usually nearly instantaneous.)

[amahle-TT]

Thank you, please confirm if you have stable connection at the moment so we can start with checks.

[Sheepdog2020]

Dear amahle-

I hope I'm putting this in the right place to reply to your question of about 17 Oct 2025, 8:45 am, UK time? (Not rhetorical... I'll try to note any answer)

As far as I am aware(!) incoming email is not my problem.

Further details of my case: For a preliminary scan, I use Firefox to access the webserver where my emails are available. I rarely use the webface to SEND emails, and probably none of the bounced emails were sent that way. (It is SENDING that has been my problem.)

After I've seen (and perhaps weeded) the incoming emails, I use Thunderbird with POP/SMTP to fetch/ manage/ send my emails.

THANK YOU for the attention you are giving this.

[amahle-TT]

Hi there, thank you for confirming. Please confirm if you can receive emails

[Sheepdog2020]

Dear fr8ys,

Hoping this is what you asked for when you said "Please post back":

I've put the affected eddress and my phone number in my Private Notes.

[fr8ys]

There is a known issue with the google and hotmail servers.

The backroom specialists are discussing to get this resolved.

Please add your affected email address to your private notes field so staff can add you yo the on-going issue.

You are in the staff's queue for a response.
For a quicker reply can you please ensure you have your personal information up to date in your profile including your TalkTalk landline phone number so your account can be traced. Link here - https://community.talktalk.co.uk/t5/user/myprofilepage/tab/personal-profile:personal-info
If you are unsure of your phone number, you can find this in My Account or dial 17070 from your landline phone and this will confirm the number for you.
You can also add your account number in the private notes field, which only you and the support staff can view.
Please post back when done.
Thank you