Mozila Thunderbird receiving mail but can't send mail

Jun 19, 2018 11:59AM PDT

I'm presently using a laptop with Windows 7 and Windows Live Mail but I have bought a new laptop running Windows 10. On this laptop I have installed Thunderbird to handle my emails. I have 4 separate email accounts and I have set them up on Thunderbird and it seemed to be working fine as my emails were being downloaded when I started Thunderbird but I was still answering my emails using the Windows 7 laptop. I decided to run a test tonight on the Windows 10 laptop by sending test emails from one account to the others but although they appeared to send and no error messages appeared no messages appeared. I have set up both laptops side by side and checked the setting etc. and everything is correct. The only difference I can see is that although my incoming mail is on both laptops, my outgoing mail has my name in front of in Thunderbird and there doesn't appear to be a way to remove my name. By the way as well as checking and double checking all my settings I have also switched off my antivirus and my firewall and sent test emails and nothing happened. I'm beginning to wonder if Thunderbird is worth the bother as getting to the stage I'm at now has been a nightmare. Any time I switched email programs in the past a couple of clicks and it was done. With Thunderbird it took be most of Sunday afternoon just to get my email contacts imported! My only reason for picking Thunderbird was because everyone said it was great and it looked similar to Live Mail. So can anyone help me out here as to why I can receive but not send emails?

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I read the setup at
Jun 19, 2018 12:40PM PDT
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Jun 19, 2018 1:13PM PDT

Yeah this isn't really very clear. I have four email accounts all with Sky or Yahoo or whoever it is now. All four accounts have different passwords and all four are working perfectly on my Windows 7 laptop using Live Mail. Are they saying that because I am now using Thunderbird that I need to change my password and if so do I have to use the same password for all four email accounts. To be honest I don't want to start changing passwords in case I get locked out of my emails altogether.

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It's Yahoo and Sky. If they aren't clear, I can't be either
Jun 19, 2018 1:25PM PDT

It calls for an app password. Which appears to be different from your account password.

On top of that it's Yahoo which has made many an email user weep. I don't use Yahoo with any email client. Reason? Too unreliable and setup instructions all over the map plus Yahoo has without notice killed off email accounts. Go figure why folk keep coming back.

In short, time to call Sky to clear this up.

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Jun 19, 2018 2:44PM PDT

Believe me I never wanted Yahoo email but that's what Sky users were switched to. Having said that I have never had a problem with it until I've tried to set it up in Thunderbird. I think you are right, time to get some advice from Sky. Thanks anyway.

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Problem likely linked to password security
Jun 21, 2018 8:20AM PDT

Likely, a password security issue is causing your emails to not be sent. Thunderbird does not support Two Factor authentication. Try disabling Two Factor verification in your Yahoo account's settings and see if you can send emails from it. Another possibility is, your email accounts with Yahoo need to be upgraded to Yahoo Plus accounts. I came across this while looking into this issue. This issue has been reported on the Internet by others. Some other email client may be worth try out with Yahoo accounts. Here is a link to a list of free computer-based email clients that are free.


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Jun 27, 2018 11:51AM PDT

Thanks for that. For some reason it seems to be working perfectly now but I guess time will tell.

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Sending mail goes through the out going SMTP server
Jun 27, 2018 11:37AM PDT

of your email provider. Make sure your settings are correct for the out going server.

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Jun 27, 2018 11:52AM PDT

Yeah I had that checked several times already and it's all good. As I said above it seems to be working now so I'll wait and see what happens. Thanks for the reply.

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