Why can't thunderbird access my mail anymore after traveling to a different country?

Question

Hello everyone,
I started having problems with Thunderbird after moving from Germany to Lebanon. First I thought it was because I changed my time zone on the computer but now I think it is more related to my yahoo account. First Thunderbird started to download one message multiple times (basically every time it went to retrieve email from all of my web accounts, but it didn't happen all the time and only to my yahoo account). Then it stopped to connect altogether giving me the report "maildrop busy". I tried opening it from time to time but it would only sometimes and apparently randomly download all the messages including yahoo but also sometimes giving me nothing or just one mail a dozen times.
Now I moved to Kyrgyztan via Turkey and since I'm only able to use yahoo through the browser I got asked to identify myself through an alternative email (web.de) which doesn't exist anymore so now my yahoo is also completely blocked in the browser. So I thought maybe Thunderbird initially couldn't download my yahoo mail because it probably asked to identify myself when I moved to Lebanon in the first place. But then why would it have been able to get the mail at some times anyway and why could I log in online without getting asked the question? Does Thunderbird identify itself automatically even when you change locations?
So I am of course in big trouble because yahoo is my main email account. The fact that I deleted my older alternative mail account is of course my own loss but can anyone say if there is a way to fix Thunderbird so maybe I would then be able to access yahoo through Thunderbird again?
(Another problem is, that yahoo offers no way to contact them directly, I did all the help and customer support sites, they are useless, and there is no phone number or mail contact...)
Scroll down for my trouble shooting report and feel free to ask any further questions on my settings etcetera, unfortunately I am not experienced enough to know what exactly you would need to know now.
Thank you!
Anna
Application Basics
Name: Thunderbird
Version: 31.3.0
User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.3.0
Profile Folder: Show Folder
(Local drive)
Application Build ID: 20141127140543
Enabled Plugins: about:plugins
Build Configuration: about:buildconfig
Memory Use: about:memory
Mail and News Accounts
account1:
INCOMING: account1, , (pop3) pop.mail.yahoo.com:995, SSL, passwordCleartext
OUTGOING: smtp.mail.yahoo.com:465, SSL, passwordCleartext, true
account2:
INCOMING: account2, , (none) Local Folders, plain, passwordCleartext
account3:
INCOMING: account3, , (pop3) pop.mail.yahoo.com:995, SSL, passwordCleartext
OUTGOING: smtp.mail.yahoo.com:465, SSL, passwordCleartext, true
account5:
INCOMING: account5, , (pop3) pop.googlemail.com:995, SSL, passwordCleartext
OUTGOING: smtp.googlemail.com:465, SSL, passwordCleartext, true
account7:
INCOMING: account7, , (imap) mail.zedat.fu-berlin.de:143, alwaysSTARTTLS, passwordCleartext
OUTGOING: mail.zedat.fu-berlin.de:587, alwaysSTARTTLS, passwordCleartext, true
Crash Reports
http://crash-stats.mozilla.com/report/index/bp-33d757a0-5287-4e63-a5d3-ad5482130822 (23.08.2013)
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Provider for Google Calendar, 1.0.3, true, {a62ef8ec-5fdc-40c2-873c-223b8a6925cc}
Important Modified Preferences
Name: Value
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browser.cache.disk.capacity: 358400
browser.cache.disk.smart_size.first_run: false
browser.cache.disk.smart_size.use_old_max: false
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font.name.serif.el: Cambria
font.name.serif.tr: Cambria
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font.name.serif.x-cyrillic: Cambria
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Graphics
Adapter Description: Mobile Intel(R) 4 Series Express Chipset Family
Vendor ID: 0x8086
Device ID: 0x2a42
Adapter RAM: Unknown
Adapter Drivers: igdumd64 igd10umd64 igdumdx32 igd10umd32
Driver Version: 8.15.10.2302
Driver Date: 2-11-2011
Direct2D Enabled: true
DirectWrite Enabled: true (6.2.9200.16571)
ClearType Parameters: ClearType parameters not found
WebGL Renderer: false
GPU Accelerated Windows: 1/1 Direct3D 10
AzureCanvasBackend: direct2d
AzureSkiaAccelerated: 0
AzureFallbackCanvasBackend: cairo
AzureContentBackend: direct2d
JavaScript
Incremental GC: 1
Accessibility
Activated: 0
Prevent Accessibility: 0
Library Versions
Expected minimum version
Version in use
NSPR
4.10.6
4.10.6
NSS
3.16.2.3 Basic ECC
3.16.2.3 Basic ECC
NSS Util
3.16.2.3
3.16.2.3
NSS SSL
3.16.2.3 Basic ECC
3.16.2.3 Basic ECC
NSS S/MIME
3.16.2.3 Basic ECC
3.16.2.3 Basic ECC

Answer 1

you could try turning off email scanning in your anti virus as that is the most common cause of intermittent can't connect and repeated download of the same mail. Other than that it is up to you and yahoo.