THe no n working account does not let me sign in.

What does this mean?

Who's your email provider?

What's the account type - POP or IMAP?

The non working account does noyt accept my password

1and1.com - web host and email Imap. The account SMTP is not obvious either

Is there any error message?

You can verify your password using webmail. Does that work?

Please post your Troubleshooting Information. At the top right of the Thunderbird window, click the menu button , then select Help > Troubleshooting Information. Press the "Copy text to clipboard button" and paste the information into your reply.

I had set it up the same as the other account. Only difference is the address - obviously

 Application Basics

   Name: Thunderbird
   Version: 52.6.0
   User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0
   Profile Folder: Open Folder

             (Local drive)
   Application Build ID: 20180123185941
   Enabled Plugins: about:plugins
   Build Configuration: about:buildconfig
   Memory Use: about:memory
   Profiles: about:profiles

 Mail and News Accounts
   account1:
     INCOMING: account1, , (imap) imap.1und1.de:993, SSL, passwordCleartext
     OUTGOING: , smtp.1und1.de:587, alwaysSTARTTLS, passwordCleartext, true

   account2:
     INCOMING: account2, , (none) Local Folders, plain, passwordCleartext

 Crash Reports

 Extensions
   Lightning, 5.4.6, true, {e2fda1a4-762b-4020-b5ad-a41df1933103}
   McAfee Anti-Spam Thunderbird Extension, 2.0, false, msktbird@mcafee.com

 Important Modified Preferences

   Name: Value

     accessibility.lastLoadDate: 1516464742
     browser.cache.disk.capacity: 358400
     browser.cache.disk.filesystem_reported: 1
     extensions.lastAppVersion: 52.6.0
     font.internaluseonly.changed: false
     font.name.monospace.el: Consolas
     font.name.monospace.x-cyrillic: Consolas
     font.name.monospace.x-unicode: Consolas
     font.name.monospace.x-western: Consolas
     font.name.sans-serif.el: Calibri
     font.name.sans-serif.x-cyrillic: Calibri
     font.name.sans-serif.x-unicode: Calibri
     font.name.sans-serif.x-western: Calibri
     font.name.serif.el: Cambria
     font.name.serif.x-cyrillic: Cambria
     font.name.serif.x-unicode: Cambria
     font.name.serif.x-western: Cambria
     font.size.fixed.el: 14
     font.size.fixed.x-cyrillic: 14
     font.size.fixed.x-unicode: 14
     font.size.fixed.x-western: 14
     font.size.variable.el: 17
     font.size.variable.x-cyrillic: 17
     font.size.variable.x-unicode: 17
     font.size.variable.x-western: 17
     mail.openMessageBehavior.version: 1
     mail.winsearch.firstRunDone: true
     mailnews.database.global.datastore.id: 653614f0-6543-421a-b196-d57b247c247
     media.gmp.storage.version.observed: 1
     network.cookie.prefsMigrated: true
     network.predictor.cleaned-up: true
     places.database.lastMaintenance: 1519326195
     places.history.expiration.transient_current_max_pages: 122334
     security.sandbox.content.tempDirSuffix: {5b3b7ef1-6a83-4fd3-b920-d8e4400915f0}

 Graphics

     GPU #1
     Description: AMD Radeon(TM) R7 Graphics
     Vendor ID: 0x1002
     Device ID: 0x9874
     RAM: 512
     Drivers: aticfx64 aticfx64 aticfx64 amdxc64 aticfx32 aticfx32 aticfx32 amdxc32 atiumd64 atidxx64 atidxx64 atiumdag atidxx32 atidxx32 atiumdva atiumd6a atitmm64
     Driver Version: 16.300.2701.0
     Driver Date: 8-9-2016

     Features
     Direct2D: false
     DirectWrite: true (10.0.16299.15)
     WebGL Renderer: Google Inc. -- ANGLE (AMD Radeon(TM) R7 Graphics Direct3D9Ex vs_3_0 ps_3_0) -- OpenGL ES 2.0 (ANGLE 2.1.0.2a250c8a0e15)

     AzureCanvasBackend: skia
     AzureCanvasAccelerated: 0
     AzureFallbackCanvasBackend: cairo
     AzureContentBackend: skia

 JavaScript

 Incremental GC: 1

 Accessibility

   Activated: 0
   Prevent Accessibility: 0

 Library Versions

     Expected minimum version
     Version in use

     NSPR
     4.13.1
     4.13.1

     NSS
     3.28.6
     3.28.6

     NSS Util
     3.28.6
     3.28.6

     NSS SSL
     3.28.6
     3.28.6

     NSS S/MIME
     3.28.6
     3.28.6

https://wiki.mozilla.org/Thunderbird:Testing:Antivirus_Related_Performance_Issues#McAfee

Thank you . But why would Macafee single out an account in Thunderbird which is the same (all be it in name) as another one that works fine?

I will try and work out the instructions and see if anything happens to the posiive

I just went into Tools etc and Extensions and found the attached message

It seems like it has been blocked already

But why would Macafee single out an account in Thunderbird which is the same (all be it in name) as another one that works fine?

Because the accounts don't have the same messages? In any case, you'll need to ask McAfee why this problem occurs in the first place.

I just went into Tools etc and Extensions and found the attached message It seems like it has been blocked already

There are other steps you'll have to take beyond this one.

Hello. What are the other steps one would have to take?

Macafee have removed the Softwarre but it has not helped my issue with the mail account not working. It does not even allow me to set up again

Any ideas would be appreciated

What are the other steps one would have to take?

Simply read the article and follow the instructions. If in doubt, ask McAfee.

I have asked Macafee. I sent them the tile and there is now nothing they can do. Nothing worked. Uninstalled Macafee and reinstalled it. Why would it affect one account and not the other? Why can I nt recreate the other account? When it askes for password it doesn't accept anything.

The instructions on the article are also not all that clear as to what would happen or how to make them happen

The instructions on the article are also not all that clear as to what would happen or how to make them happen

'Disable/delete McAfee Anti-Spam Thunderbird Extension in Thunderbird' is only the first suggestion in the article among others on how to address the problem. You can read them in the article yourself, I don't think I have to spell them out again here.

The extension appears to be disabled already as per your information above. However, none of your previous replies indicate any attempt to follow the other suggestions in the article.

Having said that, this is the Thunderbird support forum. If you're having difficulties implementing the suggested changes concerning McAfee anti-virus software, please ask in a McAfee forum.

The article also suggests what to do in case you have implemented all the suggested changes, but the problem still persists.

Uninstalled Macafee and reinstalled it.

I'm not sure why you tried that, as this is nowhere suggested in the article.

I did it as that is what Macafee suggested. They are waiting on news back to see what happened when I contacted them.

The artice about Macafee does not work anyway as there are no Extensions dealing with Macafee. The only extension is teh Moozilla Calandar.

I just wish to know whay my account has topped working. It was set up the same way as the one that does work