After debugging a lot I found that the problem is caused by the Add-on "Subject Manager 1.1.1". After disabling this plug-in sending works fine again.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to thunderbird in Ubuntu. https://bugs.launchpad.net/bugs/1797935 Title: Sending mail and saving drafts suddenly stopped working Status in thunderbird package in Ubuntu: Invalid Bug description: Since today I can neither send messages nor store drafts. Restarting thunderbird does not help. No error message is displayed. Receiving messages works fine. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: thunderbird 1:52.9.1+build3-0ubuntu0.18.04.1 ProcVersionSignature: Ubuntu 4.2.0-19.23~14.04.1-generic 4.2.6 Uname: Linux 4.2.0-19-generic x86_64 AddonCompatCheckDisabled: False ApportVersion: 2.20.9-0ubuntu7.4 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: pia 2804 F.... pulseaudio /dev/snd/controlC1: pia 2804 F.... pulseaudio BuildID: 20180710084133 Channel: Unavailable Date: Mon Oct 15 18:42:48 2018 Extensions: extensions.sqlite corrupt or missing ForcedLayersAccel: False IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite) InstallationDate: Installed on 2015-11-05 (1075 days ago) InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805) IpRoute: default via 10.75.15.254 dev eth0 proto dhcp metric 100 10.75.0.0/20 dev eth0 proto kernel scope link src 10.75.0.25 metric 100 169.254.0.0/16 dev eth0 scope link metric 1000 Locales: extensions.sqlite corrupt or missing MostRecentCrashID: bp-d23c5e7f-dfca-4ae1-9026-2e6b30180601 Plugins: Shockwave Flash - /usr/lib/gnash/libgnashplugin.so (browser-plugin-gnash) PrefErrors: 'utf-8' codec can't decode byte 0xe4 in position 928: invalid continuation byte Prefs: javascript.options.showInConsole: true ([Profile]/extensions/[email protected]/defaults/preferences/debug.js) javascript.options.strict: true ([Profile]/extensions/[email protected]/defaults/preferences/debug.js) Profiles: Profile0 (Default) - LastVersion=52.9.1/20180710084133 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: browser-plugin-gnash 0.8.11~git20160608-1.4 RunningIncompatibleAddons: False SourcePackage: thunderbird Themes: extensions.sqlite corrupt or missing UpgradeStatus: Upgraded to bionic on 2018-05-24 (144 days ago) dmi.bios.date: 04/15/2014 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 4.6.5 dmi.board.asset.tag: Tag 12345 dmi.board.name: W230SS dmi.board.vendor: Notebook dmi.board.version: Not Applicable dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 9 dmi.chassis.vendor: Notebook dmi.chassis.version: N/A dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr4.6.5:bd04/15/2014:svnNotebook:pnW230SS:pvrNotApplicable:rvnNotebook:rnW230SS:rvrNotApplicable:cvnNotebook:ct9:cvrN/A: dmi.product.name: W230SS dmi.product.version: Not Applicable dmi.sys.vendor: Notebook To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1797935/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
