Look in the full headers.

select the email and click on 'Other Actions' and select 'View source or from toolbar 'View' > 'Message Source'.

Is your email address mentioned anywhere in the full headers?

Is there a similar name, but either with a dot or without one?

Have a read of some comments posted at this link :

• http://forums.digitalspy.co.uk/showthread.php?p=65292151

If you have a Pop mail account, it is possible that those messages were downloaded and then deleted off the server.

I would suggest that you do not reply to any of these emails and contact Sky help forum. http://helpforum.sky.com/

looked at links as suggested but the difference is, if I log onto sky mail through sky, these emails do not show up. I phoned sky help and they said I needed to speak to Mozilla. I also looked at the view source, but not sure what I am looking at. The only listing with my email account details in says it has " apparently delivered to-". can you help further? This problem has only just started a week or two a go. Thanks

Thunderbird downloads messages from the Inbox of your Emil provider. I am not sure what Sky expects Mozilla to do about their inability to deliver email correctly.

What setting do you have here:

• Tools > Account Settings > Server Settings for the mail account.

or

• Menu icon > Options > Account Settings > Server Settings for the mail account.
• 'leave messages on the server'

Do you have this selected or not? Tell us your current setting.

Please post the following info so we can check server details are correct -

• In Thunderbird
• Help > Troubleshooting Information
• Click on 'copy text to clipboard'
• then paste info into this question.
• you can edit/remove all the section on fonts and printers.

I seem to only have this problem with account4 ie sky.com

 Application Basics

   Name: Thunderbird
   Version: 24.5.0
   User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0
   Profile Folder: Show Folder

             (Local drive)
   Application Build ID: 20140424091057
   Enabled Plugins: about:plugins
   Build Configuration: about:buildconfig
   Crash Reports: about:crashes
   Memory Use: about:memory

 Mail and News Accounts
   account1:
     INCOMING: account1, , (imap) imap.googlemail.com:993, SSL, passwordCleartext
     OUTGOING: smtp.googlemail.com:465, SSL, passwordCleartext, true

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

   account3:
     INCOMING: account3, , (imap) imap.googlemail.com:993, SSL, passwordCleartext
     OUTGOING: smtp.googlemail.com:465, SSL, passwordCleartext, true

   account4:
     INCOMING: account4, , (pop3) pop.tools.sky.com:995, SSL, passwordCleartext
     OUTGOING: smtp.tools.sky.com:465, SSL, passwordCleartext, true

 Extensions

 Important Modified Preferences

   Name: Value

     accessibility.typeaheadfind.flashBar: 0
     browser.cache.disk.capacity: 358400
     browser.cache.disk.smart_size.first_run: false
     browser.cache.disk.smart_size.use_old_max: false
     browser.cache.disk.smart_size_cached_value: 358400
     extensions.lastAppVersion: 24.5.0
     font.name.monospace.el: Consolas
     font.name.monospace.tr: Consolas
     font.name.monospace.x-baltic: Consolas
     font.name.monospace.x-central-euro: 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.tr: Calibri
     font.name.sans-serif.x-baltic: Calibri
     font.name.sans-serif.x-central-euro: 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.tr: Cambria
     font.name.serif.x-baltic: Cambria
     font.name.serif.x-central-euro: 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.tr: 14
     font.size.fixed.x-baltic: 14
     font.size.fixed.x-central-euro: 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.tr: 17
     font.size.variable.x-baltic: 17
     font.size.variable.x-central-euro: 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.enable: true
     mail.winsearch.firstRunDone: true
     mail.winsearch.global_reindex_time: 1393337011
     mailnews.database.global.datastore.id: 19724bce-5842-4f19-9427-4a60da38c0e
     network.cookie.prefsMigrated: true
     places.database.lastMaintenance: 1398505067
     places.history.expiration.transient_current_max_pages: 104858
     plugin.importedState: true
     print.printer_HP_Photosmart_Prem_C410_series.print_bgcolor: false
     print.printer_HP_Photosmart_Prem_C410_series.print_bgimages: false
     print.printer_HP_Photosmart_Prem_C410_series.print_colorspace:
     print.printer_HP_Photosmart_Prem_C410_series.print_command:
     print.printer_HP_Photosmart_Prem_C410_series.print_downloadfonts: false
     print.printer_HP_Photosmart_Prem_C410_series.print_duplex: 0
     print.printer_HP_Photosmart_Prem_C410_series.print_edge_bottom: 0
     print.printer_HP_Photosmart_Prem_C410_series.print_edge_left: 0
     print.printer_HP_Photosmart_Prem_C410_series.print_edge_right: 0
     print.printer_HP_Photosmart_Prem_C410_series.print_edge_top: 0
     print.printer_HP_Photosmart_Prem_C410_series.print_evenpages: true
     print.printer_HP_Photosmart_Prem_C410_series.print_footercenter:
     print.printer_HP_Photosmart_Prem_C410_series.print_footerleft: &PT
     print.printer_HP_Photosmart_Prem_C410_series.print_footerright: &D
     print.printer_HP_Photosmart_Prem_C410_series.print_headercenter:
     print.printer_HP_Photosmart_Prem_C410_series.print_headerleft: &T
     print.printer_HP_Photosmart_Prem_C410_series.print_headerright: &U
     print.printer_HP_Photosmart_Prem_C410_series.print_in_color: true
     print.printer_HP_Photosmart_Prem_C410_series.print_margin_bottom: 0.5
     print.printer_HP_Photosmart_Prem_C410_series.print_margin_left: 0.5
     print.printer_HP_Photosmart_Prem_C410_series.print_margin_right: 0.5
     print.printer_HP_Photosmart_Prem_C410_series.print_margin_top: 0.5
     print.printer_HP_Photosmart_Prem_C410_series.print_oddpages: true
     print.printer_HP_Photosmart_Prem_C410_series.print_orientation: 0
     print.printer_HP_Photosmart_Prem_C410_series.print_page_delay: 50
     print.printer_HP_Photosmart_Prem_C410_series.print_paper_data: 9
     print.printer_HP_Photosmart_Prem_C410_series.print_paper_height: 11.00
     print.printer_HP_Photosmart_Prem_C410_series.print_paper_name:
     print.printer_HP_Photosmart_Prem_C410_series.print_paper_size_type: 0
     print.printer_HP_Photosmart_Prem_C410_series.print_paper_size_unit: 1
     print.printer_HP_Photosmart_Prem_C410_series.print_paper_width: 8.50
     print.printer_HP_Photosmart_Prem_C410_series.print_plex_name:
     print.printer_HP_Photosmart_Prem_C410_series.print_resolution: 232004032
     print.printer_HP_Photosmart_Prem_C410_series.print_resolution_name:
     print.printer_HP_Photosmart_Prem_C410_series.print_reversed: false
     print.printer_HP_Photosmart_Prem_C410_series.print_scaling: 1.00
     print.printer_HP_Photosmart_Prem_C410_series.print_shrink_to_fit: true
     print.printer_HP_Photosmart_Prem_C410_series.print_to_file: false
     print.printer_HP_Photosmart_Prem_C410_series.print_unwriteable_margin_bottom: 0
     print.printer_HP_Photosmart_Prem_C410_series.print_unwriteable_margin_left: 0
     print.printer_HP_Photosmart_Prem_C410_series.print_unwriteable_margin_right: 0
     print.printer_HP_Photosmart_Prem_C410_series.print_unwriteable_margin_top: 0

 Graphics

     Adapter Description: Intel(R) HD Graphics 4600
     Vendor ID: 0x8086
     Device ID: 0x0416
     Adapter RAM: Unknown
     Adapter Drivers: igdumdim64 igd10iumd64 igd10iumd64 igdumdim32 igd10iumd32 igd10iumd32
     Driver Version: 10.18.10.3412
     Driver Date: 1-22-2014
     Adapter Description (GPU #2): NVIDIA GeForce GTX 770M
     Vendor ID (GPU #2): 0x10de
     Device ID (GPU #2): 0x11e0
     Adapter RAM (GPU #2): 3072
     Adapter Drivers (GPU #2): nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um
     Driver Version (GPU #2): 9.18.13.3523
     Driver Date (GPU #2): 3-4-2014
     Direct2D Enabled: false
     DirectWrite Enabled: false (6.3.9600.16384)
     ClearType Parameters: Gamma: 2200 Pixel Structure: RGB ClearType Level: 100 Enhanced Contrast: 50
     WebGL Renderer: false
     GPU Accelerated Windows: 0

     AzureCanvasBackend: skia
     AzureFallbackCanvasBackend: cairo
     AzureContentBackend: none

 JavaScript

 Incremental GC: 1

 Accessibility

   Activated: 0
   Prevent Accessibility: 0

 Library Versions

     Expected minimum version
     Version in use

     NSPR
     4.10.2
     4.10.2

     NSS
     3.15.4 Basic ECC
     3.15.4 Basic ECC

     NSS Util
     3.15.4
     3.15.4

     NSS SSL
     3.15.4 Basic ECC
     3.15.4 Basic ECC

     NSS S/MIME
     3.15.4 Basic ECC
     3.15.4 Basic ECC

There is nothing wrong with the settings.

You are accessing Sky Yahoo Mail using POP settings.

If you keep messages on the server, to check webmail emails you mentioned that you logged on to sky.com, but did you logon to Yahoo Sky Mail to check emails?

I'm not sure if logging into Sky auto logs you in yahoo sky.

• see info: http://help.sky.com/email/set-up-sky-yahoo-mail/get-started-with-sky-yahoo-mail

Any email you download for the Sky pop mail account will only come from the server Inbox.

Suggest to check carefully through the message source of the email. select email then 'View' > 'Message Source'.

It is possible that the email is Spam and was sent to you and loads of other people possibly in a Bcc. You might see that there are different versions of the first part of email address but all have the @sky.com domain. Do not respond to any of these emails as it will only prove to the spammer that your email address is live.

Make sure your settings 'leave messages on the server'. then you can logon to webmail and select those emails as Spam. There may be settings to set up a Spam filtering.

Sky claim they take action against spammers.

• http://help.sky.com/email/problems-with-sky-yahoo-mail/spam-and-hoax-emails

In Thunderbird, check your Junk Controls and then select the email as Junk. Here is link to Junk Controls.

• http://kb.mozillazine.org/Junk_Mail_Controls