Further testing fixed this symptom by quoting the name field containing the commas on the sending side. This does not appear to be an MUA error and should probably be closed.
-- 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/1600057 Title: Sender Display Name with comm appears as two senders Status in thunderbird package in Ubuntu: New Bug description: Symptom sounds similar to that described in Bug 1166206 https://bugzilla.mozilla.org/show_bug.cgi?id=1166206 When email sender display name contains a comma, it appears as if it were sent from two senders. Example: Message source: From: Something, Something Darkside <[email protected]> Thunderbird: From Something <>, Something Darkside <[email protected]> I had 38.8.0 from trusty-updates installed when I noticed this problem and added the thunderbird-next PPA to see if it had been fixed. The symptom still persists. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: thunderbird 1:45.2~b1+build2-0ubuntu0.14.04.1 [origin: LP-PPA-mozillateam-thunderbird-next] ProcVersionSignature: Ubuntu 3.13.0-91.138-generic 3.13.11-ckt39 Uname: Linux 3.13.0-91-generic x86_64 NonfreeKernelModules: wl nvidia AddonCompatCheckDisabled: False ApportVersion: 2.14.1-0ubuntu3.21 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: artgravity 3427 F.... pulseaudio /dev/snd/controlC0: artgravity 3427 F.... pulseaudio BuildID: 20160602231857 Channel: beta CurrentDesktop: Unity Date: Thu Jul 7 17:56:32 2016 Extensions: extensions.sqlite corrupt or missing ForcedLayersAccel: False IfupdownConfig: # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite) InstallationDate: Installed on 2013-07-27 (1076 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424) IpRoute: default via 10.26.0.1 dev wlan0 proto static 10.26.0.0/24 dev wlan0 proto kernel scope link src 10.26.0.141 metric 9 192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 Locales: extensions.sqlite corrupt or missing Profiles: Profile0 (Default) - LastVersion=45.2/20160602231857 RelatedPackageVersions: totem-mozilla 3.10.1-1ubuntu4 rhythmbox-mozilla 3.0.2-0ubuntu2 icedtea-7-plugin 1.5.3-0ubuntu0.14.04.1 google-talkplugin 5.41.3.0-1 adobe-flashplugin 1:20160616.1-0ubuntu0.14.04.1 RunningIncompatibleAddons: False SourcePackage: thunderbird Themes: extensions.sqlite corrupt or missing UpgradeStatus: Upgraded to trusty on 2014-04-19 (810 days ago) dmi.bios.date: 12/05/2013 dmi.bios.vendor: Dell Inc. dmi.bios.version: A16 dmi.board.name: 0K42JR dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA16:bd12/05/2013:svnDellInc.:pnLatitudeE6410:pvr0001:rvnDellInc.:rn0K42JR:rvrA00:cvnDellInc.:ct9:cvr: dmi.product.name: Latitude E6410 dmi.product.version: 0001 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1600057/+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

