Lineone.net email stopped working

[RICKDIfedup]

Hi, I have the same problem.

It seams every year there is an issue with @Lineone which takes hours if not days to correct.

Bearing in mind I have not changed my settings etc. 

I have given up webchat etc just the same old questions.

But I have not changed anything its your end but they will not have it.

Hours wasted.

[RICKDIfedup]

Hi just started working again strange.

[RICKDIfedup]

Hi my lineone does not send again Error ox80042108

[Gondola]

The reason that you're asked to accept the certificate / continue using the talktalk.net server is because the target principal name of lineone.net is a domain that is not listed on the security certificate for mail.talktalk.net.  Outlook 2016 should be saving the security certificate automatically but if not then View Certificate and Install Certificate.

[RICKDIfedup]

The only thing is I keep getting a note come up...

Target principal name is incorrect .. View certificate... Do you want to continue using this server.

I click yes and it works but just wondering if there is a reason for the note.

Many thanks 

[Gondola]

Thank you so much for your kind appreciation of my support.

[RICKDIfedup]

Yippee its working. Excellent

Thank you very much.

You certainly know your stuff.

[Gondola]

Just say yes. Accept the certificate and carry on.

[RICKDIfedup]

Hi Thanks.

Done that .

Just says security certificate can not be verified.

Do you want to continue using this server ?

Thanks

[Gondola · Accepted solution]

That's certainly an Outlook 2016 version that is supposedly supported (although Microsoft themselves have deprecated even earlier versions of Outlook 2016 software) it does not appear to have been updated with the later Outlook 2016 software that supports the StartTLS command. i.e. it's actually based on the former Outlook 2013 software. Why it never got updated is as much a mystery as to why Microsoft launched it with that software.

On the Advanced tab

• Incoming Mail section
  Set Port to 993
  Set Encryption Method to SSL
• Outgoing Mail section
  Set Port to 587
  Set Encryption Method to TLS or Auto
  

On the outgoing server tab

• Tick my outgoing SMTP server requires authentication
• Log on using
  Username (full email address)
  Password
• Done

Also check that the computer's Internet options do have TLS 1.2 ticked.

Select start button / windows icon
Type Internet Options, Select Internet Options
Select Internet Properties - Advanced Tab
Scroll down
Untick Use SSL 3.0
Untick Use TLS 1.0
Untick Use TLS 1.1
Tick Use TLS 1.2
Tick Use TLS 1.3

[RICKDIfedup]

I am trying to put a picture on here clearly showing the licence but it will not let me so here is what it says

Microsoft Outlook 2016 (16.0.5257.1000) MSO 00339-10000-0000AA784

It was working up to a few days ago. My other 4 emails work perfect talktalk, tiscali

None have StartTLS option 

Many thanks for your help

[Gondola]

No it is not.

Where do you see that it's purporting to be Outlook 2016?  If it were Outlook 2016 then it would have as an outgoing server connection security option the StartTLS option in the drop-down menu.

I think it's Outlook 2010 or 2013. From the Outlook toolbar select Help > About

[RICKDIfedup]

Hi its defiantly Outlook 2016 I just checked.

It was working up to a few days ago.

Thanks

[Gondola]

In that case you do not have Outlook 2016 but an earlier version. TalkTalk supports Outlook 2016 or later but not the earlier versions.

Let me know your chosen upgrade path. Windows Mail, Outlook 2016 - 365, Thunderbird, BlueMail etc.

[RICKDIfedup]

Also says does not support connection encryption i have chosen

[RICKDIfedup]

Hi Now says Can not verify security certificate

On my options I have    none - SSl - TLS- Auto

When I click SSI or TLS it revert back to 25

Thanks

[Gondola]

Your Outlook 2016 is capable of secure mail sending.

• Incoming Mail section
  Set Port to 993
  Set Encryption Method to SSL/TLS
• Select the Outgoing Mail section
  Set Port to 587
  Set Encryption Method to STARTTLS
• Tick my outgoing SMTP server requires authentication
• Done

[RICKDIfedup]

Hi. Correction.... I can send from my web mail.

Just not from my computer. I have 4 messages in my out box.

I am using outlook 2016 windows 10

Thanks for your help

[Gondola]

Ok, so the reason for not sending via Outlook is that you're still using insecure ports and not using TLS 1.2 encryption security.

Which version of Outlook are you using on Windows 10? Outlook 2016 or newer up to Outlook 365 are the supported email software versions.

You'll be able to send mail from webmail but if you're saying that you see nothing in the Sent objects folder then that suggests you're sending from software set up as a POP3 mail account that does not sync to the online mailbox OR an IMAP account that saves sent mail locally and hasn't got the Sent objects folder synchronised.

[RICKDIfedup]

IMAP 143 SMP 25 no security. 

I have tried all suggested options  I am receiving but not sending 

[RICKDIfedup]

Hi. I am using outlook on window 10 home computer if i log in to web mail i can see incoming but no out going.

Thanks