I would suggest checking your firewall.

Matt said

I would suggest checking your firewall.

Thanks for your suggestion Matt. Are you aware whether xubuntu has a firewall and how I can check whether creates problems with Thunderbird?

Do you reckon it has something to do with that if nothing has changed with the firewall (if xubuntu has one) since Thunderbird worked the last time?

I am yet to see a Linux distribution that does not have a firewall, if it is enabled is another question. But I know nothing about our distribution.

Perhaps google the firewall.

Hi Matt,

I disabled the firewall (in case it was enabled before) and am still encountering the same problem.

Thunderbird also keeps crashing and sending crash reports to Mozilla when I close it (below is the latest crash report)

Any other ideas what I could do to fix it if it's not the firewall, not the ISP and not the login-data?

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Add-ons: messagingmenu%40mozilla.com:1.3.1,%7B972ce4c6-7e08-4474-a285-3208198ce6fd%7D:52.5.0,langpack-en-GB%40thunderbird.mozilla.org:52.5.0 AsyncPluginShutdownStates: {-:{-:"012345=Async shutdown complete"}} BuildID: 20171122155701 ContentSandboxCapabilities: 117 CrashTime: 1517255686 EMCheckCompatibility: true Email: janosch.ks@posteo.net FramePoisonBase: 7ffffffff0dea000 FramePoisonSize: 4096 InstallTime: 1513268087 MozCrashReason: MOZ_CRASH(Shutdown too long, probably frozen, causing a crash.) Notes: Ubuntu 16.04.3 LTSFP(D00-L1100-W00000000-T0000) OpenGL: Intel Open Source Technology Center -- Mesa DRI Intel(R) Ironlake Mobile -- 2.1 Mesa 17.2.4 -- texture_from_pixmap

ProductID: {3550f703-e582-4d05-9a08-453d09bdfdc6} ProductName: Thunderbird ReleaseChannel: release SafeMode: 0 SecondsSinceLastCrash: 254 ShutdownProgress: xpcom-shutdown StartupCrash: 0 StartupTime: 1517255490 TelemetryEnvironment: {"build":{"applicationId":"{3550f703-e582-4d05-9a08-453d09bdfdc6}","applicationName":"Thunderbird","architecture":"x86-64","buildId":"20171122155701","version":"52.5.0","vendor":null,"platformVersion":"52.5.0","xpcomAbi":"x86_64-gcc3","hotfixVersion":null},"partner":{"distributionId":null,"distributionVersion":null,"partnerId":null,"distributor":null,"distributorChannel":null,"partnerNames":[]},"system":{"memoryMB":7773,"virtualMaxMB":null,"cpu":{"count":4,"cores":2,"vendor":"GenuineIntel","family":6,"model":37,"stepping":5,"l2cacheKB":256,"l3cacheKB":3072,"speedMHz":2534,"extensions":["hasMMX","hasSSE","hasSSE2","hasSSE3","hasSSSE3","hasSSE4_1","hasSSE4_2"]},"os":{"name":"Linux","version":"4.13.0-32-generic","locale":"en-US"},"hdd":{"profile":{"model":null,"revision":null},"binary":{"model":null,"revision":null},"system":{"model":null,"revision":null}},"gfx":{"D2DEnabled":null,"DWriteEnabled":null,"ContentBackend":"Skia","adapters":[{"description":"Intel Open Source Technology Center -- Mesa DRI Intel(R) Ironlake Mobile ","vendorID":"Intel Open Source Technology Center","deviceID":"Mesa DRI Intel(R) Ironlake Mobile ","subsysID":null,"RAM":null,"driver":null,"driverVersion":"2.1 Mesa 17.2.4","driverDate":null,"GPUActive":true}],"monitors":[],"features":{"compositor":"basic"}}},"settings":{"blocklistEnabled":true,"e10sEnabled":false,"e10sCohort":"unknown","telemetryEnabled":false,"locale":"en-US","update":{"channel":"release","enabled":true,"autoDownload":true},"userPrefs":{"browser.cache.disk.capacity":358400},"addonCompatibilityCheckEnabled":true,"isDefaultBrowser":null},"profile":{"creationDate":17514},"addons":{"activeAddons":{"messagingmenu@mozilla.com":{"blocklisted":false,"description":"This extension integrates Thunderbird into the Ubuntu Unity messaging menu and launcher","name":"Messaging Menu and Unity Launcher integration","userDisabled":false,"appDisabled":false,"version":"1.3.1","scope":4,"type":"extension","foreignInstall":true,"hasBinaryComponents":false,"installDay":17492,"updateDay":17492,"isSystem":false}},"theme":{"id":"{972ce4c6-7e08-4474-a285-3208198ce6fd}","blocklisted":false,"description":"The default theme.","name":"Default","userDisabled":false,"appDisabled":false,"version":"52.5.0","scope":4,"foreignInstall":false,"hasBinaryComponents":false,"installDay":17492,"updateDay":17492},"activePlugins":[{"name":"Shockwave Flash","version":"28.0.0.137","description":"Shockwave Flash 28.0 r0","blocklisted":false,"disabled":false,"clicktoplay":false,"mimeTypes":["application/x-shockwave-flash","application/futuresplash"],"updateDay":17544}],"activeGMPlugins":{},"activeExperiment":{},"persona":null}} Theme: classic/1.0 Throttleable: 1 UptimeTS: 196.4643577 Vendor: Version: 52.5.0 useragent_locale: en-US

This report also contains technical information about the state of the application when it crashed.

A shut down hang that is converted to a crash. while the crash ids from troubleshooting information would be helpful, does this occur if you start Thunderbird in safe mode/ without add-ons from the help menu?