You will probably get better answers if you post this question on the Thunderbird support forum.

If you are connected to the accounts using the IMAP protocol, you can try removing the accounts from Thunderbird and then adding them back manually. If you are connected to the accounts using the POP3 protocol, then you can do so, but will lose your emails that are saved to the computer.

But that is the extent of my comfort zone on Thunderbird, so I think the Thunderbird support team would be of greater help to you.

Thanks very much for the effort! As I admitted, I sort of conflated the names Firefox and Thunderbird (I use both), and I did not see any easy way to withdraw the question. Anyway, it is Imap, and I was hoping to avoid having to delete and reinstall the accounts. I will resubmit my question to the Thunderbird team. Regards, Opticist

I see my question has been rerouted to the correct team; sorry for being confused! I found a similar question that had not been answered, and they said to go to Help - Troubleshooting Information, and then copy text to clipboard. Shall I paste that text here?

Yes. Click in the reply window and press control+v.

It won't let me send so much data, so I will cut out some stuff about an obsolete printer:

Application Basics Name Thunderbird Version 52.8.0 User Agent Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 Profile Folder Open Folder (Local drive) Application Build ID 20180516145259 Enabled Plugins about:plugins

Build Configuration about:buildconfig

Memory Use about:memory

Profiles about:profiles

Mail and News Accounts ID Incoming server Outgoing servers Name Connection security Authentication method Name Connection security Authentication method Default? account2 (none) Local Folders plain passwordCleartext account4 (imap) imap.googlemail.com:993 SSL passwordCleartext smtp.googlemail.com:465 SSL passwordCleartext true account5 (imap) exchange.mines.edu:993 SSL passwordCleartext exchange.mines.edu:587 SSL passwordCleartext true account6 (imap) imap.googlemail.com:993 SSL passwordCleartext smtp.googlemail.com:465 SSL passwordCleartext true Crash Reports Report ID Submitted bp-5cdde9eb-e5fb-4979-853c-555562161212 12/11/2016 bp-41c44553-b8bf-4eff-b8cd-cd6572161210 12/10/2016 Extensions Name Version Enabled ID Lightning 5.4.8 true {e2fda1a4-762b-4020-b5ad-a41df1933103} Important Modified Preferences Name Value accessibility.lastLoadDate 1529523040 accessibility.typeaheadfind.flashBar 0 browser.cache.disk.capacity 358400 browser.cache.disk.filesystem_reported 1 browser.cache.disk.smart_size_cached_value 358400 browser.cache.disk.smart_size.first_run false browser.cache.disk.smart_size.use_old_max false dom.apps.reset-permissions true dom.max_chrome_script_run_time 0 extensions.lastAppVersion 52.8.0 font.internaluseonly.changed false 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 18 gfx.blacklist.suggested-driver-version 10.6 gfx.crash-guard.glcontext.appVersion 45.8.0 gfx.crash-guard.glcontext.deviceID 0x0102 gfx.crash-guard.glcontext.driverVersion 9.17.10.4459 gfx.crash-guard.glcontext.gfx.driver-init.direct3d11-angle true gfx.crash-guard.glcontext.gfx.driver-init.webgl-angle true gfx.crash-guard.glcontext.gfx.driver-init.webgl-angle-force-d3d11 false gfx.crash-guard.glcontext.gfx.driver-init.webgl-angle-force-warp false gfx.crash-guard.glcontext.gfx.driver-init.webgl-angle-try-d3d11 true gfx.crash-guard.status.glcontext 2 gfx.direct3d.last_used_feature_level_idx 0 mail.openMessageBehavior.version 1 mail.winsearch.firstRunDone true mailnews.database.global.datastore.id c805277f-2226-4493-80a8-c8a30d67f8f media.gmp.storage.version.observed 1 network.cookie.prefsMigrated true network.predictor.cleaned-up true places.database.lastMaintenance 1529177221 places.history.expiration.transient_current_max_pages 97998 plugin.disable_full_page_plugin_for_types application/pdf plugin.importedState true plugin.state.npdgnria 2 plugins.update.notifyUser true print.print_printer Dell Photo AIO Printer 924 print.printer_Canon_MX490_series.print_bgcolor false print.printer_Canon_MX490_series.print_bgimages false print.printer_Canon_MX490_series.print_duplex -437918235 print.printer_Canon_MX490_series.print_edge_bottom 0 print.printer_Canon_MX490_series.print_edge_left 0 print.printer_Canon_MX490_series.print_edge_right 0 print.printer_Canon_MX490_series.print_edge_top 0 print.printer_Canon_MX490_series.print_evenpages true print.printer_Canon_MX490_series.print_footercenter print.printer_Canon_MX490_series.print_footerleft &PT print.printer_Canon_MX490_series.print_footerright &D print.printer_Canon_MX490_series.print_headercenter print.printer_Canon_MX490_series.print_headerleft &T print.printer_Canon_MX490_series.print_headerright &U print.printer_Canon_MX490_series.print_in_color true print.printer_Canon_MX490_series.print_margin_bottom 0.5 print.printer_Canon_MX490_series.print_margin_left 0.5 print.printer_Canon_MX490_series.print_margin_right 0.5 print.printer_Canon_MX490_series.print_margin_top 0.5 print.printer_Canon_MX490_series.print_oddpages true print.printer_Canon_MX490_series.print_orientation 0 print.printer_Canon_MX490_series.print_page_delay 50 print.printer_Canon_MX490_series.print_paper_data 1 print.printer_Canon_MX490_series.print_paper_height 11.00 print.printer_Canon_MX490_series.print_paper_name print.printer_Canon_MX490_series.print_paper_size_type 0 print.printer_Canon_MX490_series.print_paper_size_unit 0 print.printer_Canon_MX490_series.print_paper_width 8.50 print.printer_Canon_MX490_series.print_resolution -437918235 print.printer_Canon_MX490_series.print_reversed false print.printer_Canon_MX490_series.print_scaling 1.00 print.printer_Canon_MX490_series.print_shrink_to_fit true print.printer_Canon_MX490_series.print_to_file false print.printer_Canon_MX490_series.print_unwriteable_margin_bottom 0 print.printer_Canon_MX490_series.print_unwriteable_margin_left 0 print.printer_Canon_MX490_series.print_unwriteable_margin_right 0 print.printer_Canon_MX490_series.print_unwriteable_margin_top 0 print.printer_Dell_Photo_AIO_Printer_924.print_bgcolor false print.printer_Dell_Photo_AIO_Printer_924.print_bgimages false print.printer_Dell_Photo_AIO_Printer_924.print_colorspace

***		

security.sandbox.content.tempDirSuffix {aaf6e801-0176-4881-a135-1878e2b52b22} Graphics GPU #1 Description Intel(R) HD Graphics Vendor ID 0x8086 Device ID 0x0102 RAM Unknown Drivers igdumd64 igd10umd64 igd10umd64 igdumd32 igd10umd32 igd10umd32 Driver Version 9.17.10.4459 Driver Date 5-19-2016 Features Direct2D false DirectWrite true (10.0.17134.1) WebGL Renderer Google Inc. -- ANGLE (Intel(R) HD Graphics Direct3D9Ex vs_3_0 ps_3_0) -- OpenGL ES 2.0 (ANGLE 2.1.0.2a250c8a0e15) AzureCanvasBackend skia AzureCanvasAccelerated 0 AzureFallbackCanvasBackend cairo AzureContentBackend skia JavaScript Incremental GC 1 Accessibility Activated 0 Prevent Accessibility 0 Library Versions Expected minimum version Version in use NSPR 4.13.1 4.13.1 NSS 3.28.6 3.28.6 NSS Util 3.28.6 3.28.6 NSS SSL 3.28.6 3.28.6 NSS S/MIME 3.28.6 3.28.6

Go to account settings and change the Authentication Method from Normal Password to Oauth2 for both IMAP and SMTP servers.

Dammit - I may need an app specific password, but I have not got time to play with it right now. Pls do not do anything till I get a chance to try that and report back.

Sorry - we crossed in the mail. I will change the acct settings as you instructed.

Change to OAuth2 worked on the incoming server but not outgoing. I made the change under Server settings - Security settings. Server type is Imap Mail Server.

I had to both change the authentication method and apply an app specific password, and everything seems OK now. I made a mistake on 1 account, but I think I can fix it by changing the password. Many thanks for the help and the patience! Opticist

I spoke too soon. I have 2 gmail accounts on Thunderbird. I somehow conflated Account3@gmail.com with Account1@gmail.com when getting an app specific password. Now, whereas Account3 receives mail, when it sends mail, that mail is identified as having come from Account1. Since Account3 is supposed to be anonymous, I have to change it back. I cannot find anywhere in the settings for Account3 that suggests Account1. Whenever I try to get an app specific password for Account3, it says enter the password for Account1. Account3 sends correctly from the browser. Any thoughts?

I do not believe you need the app specific password when using oauth2. It has been a while since I set mine up but I remember just changing the Authentication to Oauth2 and a logon to Gmail came up. I signed in with my normal gmail password and it saved a token in Thunderbird password manager. But that is not your issue. Gmail demands a dedicated SMTP server for each and every one of your accounts. If you try to use just one SMTP setup for all accounts then everything you send looks like it is coming from that one account. Go into the SMTP server setup and make sure you have a dedicated setup for each of your accounts and they are assigned correctly to the right account.

If I remember right, I needed an app specific password when I went to 2-factor authentication. That is why I thought I needed one now. At any rate, everything worked fine before, and I think I conflated the 2 accounts when I got the app specific password - somehow Google decided to switch me to my default account, and I did not notice. I have no idea now how to get it back. (Each account has its own account name, its own e-mail address, and so on, which is what I think you mean by "dedicated Smtp server." ) So I am stuck!

Incidentally, when I look at my passwords, I have a long, complicated string instead of what I think is my password. That password works on another computer. Is that long string what you mean by a token?

This is where is picture is better than words. One image shows the two different places inside Server Settings to create/edit SMTP servers and the other place to assign them to accounts. The other image shows the create/edit screen. All gmail accounts will be the same except for the description, important for you to know which is which, and the username, important so gmail will not change the Sent from address.

Let me make sure I understand. I have 2 outgoing server settings, besides my university's. Like yours, one is shown boldface, called Google Mail, and labeled "Default." The other is also called Google Mail and has the same smtp.googlemail.com. Do I need to change "Google Mail" to something else for the second (nondefault) account? If that is what you mean, I can do all the rest.

Yes, make sure your two gmail smtp setups have distinguishable names. (Airmail's picture #2).

Then check which name appears in each individual account's outgoing server settings (Airmail's picture #1.)

I generally use the account's email address as its name or description. Or I add "pop" or "imap", as appropriate, if I need to set up an account using both protocols. (Usually only for research or testing purposes; there is generally no value in having an account set up twice. )

It was somewhat confusing, and I had to get an app password, but it seems to have worked. Many thanks to you and airmail! Opticist

I think I have everything working now, but 1 item (among many) I do not understand: When I reveal my passwords (Tools - Options - Saved passwords) instead of seeing my gmail password I see a long unintelligible string. Previously (and now on my university account) I saw the actual password. Is everything OK?

That is the token gmail assigns when using oauth2.

Yes, I thought something like that but did not know where it came from. All is well now, and thank you once again!