Are any of these gmail accounts?

What addresses appear in these incoming messages? Are they addressed to your different accounts, or all to the same one? If the former, then my next paragraph may be ignored.

If you have 6 incoming gmail accounts, you need 6 distinct outgoing (SMTP) gmail accounts, each set up with its own username/email address, and each associated with its respective incoming account.

And let's be careful. Are you using View|Folders|All? Are these IMAP or POP? If POP, are they perhaps set to use a common Global Inbox?

Hi

I've got 3 professional emails from my domain and 3 gmail.

All the answers are going to one of the Gmail account it's very strange.

Thanks for your answer

If I send an email with my personnal account to one of my professional mails, it will appear on thunderbird like if I had sent it to the gmail...

You haven't said anything that helps very much yet. ;-)

Please post your Troubleshooting Information. To find the Troubleshooting Information:

• Open Help (or click on three-line-icon [≡] and select Help).
• Choose Troubleshooting Information.
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Please post back with this information and any other questions you might have.

WARNING:

 This contains sensitive information which shouldn't be forwarded or published without permission.

 Application Basics

   Name: Thunderbird
   Version: 52.4.0
   User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.4.0
   Profile Folder: /Users/marc/Library/Thunderbird/Profiles/foj401ws.default
   Application Build ID: 20171004092449
   Enabled Plugins: about:plugins
   Build Configuration: about:buildconfig
   Memory Use: about:memory
   Profiles: about:profiles

 Mail and News Accounts
   account1:
     INCOMING: account1, marc@pointsmartphone.fr, (imap) ssl0.ovh.net:993, SSL, passwordCleartext
     OUTGOING: Marc <marc@pointsmartphone.fr>, smtp.gmail.com:465, SSL, OAuth2, true

   account2:
     INCOMING: account2, Local Folders, (none) Local Folders, plain, passwordCleartext

   account3:
     INCOMING: account3, achat@pointsmartphone.fr, (imap) ssl0.ovh.net:993, SSL, passwordCleartext
     OUTGOING: Achat <achat@pointsmartphone.fr>, smtp.gmail.com:465, SSL, OAuth2, true

   account4:
     INCOMING: account4, reparation@pointsmartphone.fr, (imap) ssl0.ovh.net:993, SSL, passwordCleartext
     OUTGOING: Marc <reparation@pointsmartphone.fr>, smtp.gmail.com:465, SSL, OAuth2, true

   account6:
     INCOMING: account6, marcmacia.ps@gmail.com, (imap) imap.gmail.com:993, SSL, OAuth2
     OUTGOING: marc <marcmacia.ps@gmail.com>, smtp.gmail.com:465, SSL, OAuth2, true

   account8:
     INCOMING: account8, svps.marc@gmail.com, (imap) imap.gmail.com:993, SSL, OAuth2
     OUTGOING: SVPS <svps.marc@gmail.com>, smtp.gmail.com:465, SSL, OAuth2, true

   account9:
     INCOMING: account9, servicetechnique.ps@gmail.com, (imap) imap.gmail.com:993, SSL, OAuth2
     OUTGOING: service technique <servicetechnique.ps@gmail.com>, smtp.gmail.com:465, SSL, OAuth2, true

 Crash Reports

 Extensions
   Lightning, 5.4.4, false, {e2fda1a4-762b-4020-b5ad-a41df1933103}

 Important Modified Preferences

   Name: Value

     accessibility.typeaheadfind.flashBar: 0
     browser.cache.disk.capacity: 358400
     browser.cache.disk.filesystem_reported: 1
     extensions.lastAppVersion: 52.4.0
     mail.openMessageBehavior.version: 1
     mail.spotlight.firstRunDone: true
     mailnews.database.global.datastore.id: c447f237-6939-7346-8070-f98d4853f15
     mailnews.database.global.views.conversation.columns: {"threadCol":{"visible":true,"ordinal":"1"},"flaggedCol":{"visible":true,"ordinal":"3"},"attachmentCol":{"visible":false…
     media.gmp.storage.version.observed: 1
     network.cookie.prefsMigrated: true
     network.predictor.cleaned-up: true
     places.database.lastMaintenance: 1511440802
     places.history.expiration.transient_current_max_pages: 122334
     security.sandbox.content.tempDirSuffix: {2f0fb519-bf46-da47-8ca3-f303b0619742}

 Graphics

     GPU #1
     Vendor ID: 0x10de
     Device ID: 0x0fd5

     Features
     WebGL Renderer: NVIDIA Corporation -- NVIDIA GeForce GT 650M OpenGL Engine -- 2.1 NVIDIA-10.17.5 355.10.05.45f01

     AzureCanvasBackend: skia
     AzureCanvasAccelerated: 0
     AzureFallbackCanvasBackend: none
     AzureContentBackend: skia
     TileHeight: 512
     TileWidth: 512

 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

Thanks so much for helping me.

Several of your accounts don't appear to use gmail for incoming, but do use it for sending.

I think it's rather bad practice, but if you send using a gmail smtp server, Google silently replaces the "from:" address you chose in your message when writing it by the gmail email address associated with the gmail smtp server. Hence all messages sent using accounts 1, 3 and 4 will appear to the recipient to have been sent from one of your gmail accounts.

You need to either find an alternative SMTP server to use with these accounts, or add these accounts to one of your gmail accounts so they can be used within the gmail system but retain their separate identities.

Gmail offer two types: aliases and "send on behalf of another account". I generally use the second option. But be aware that you might get a note added to your messages indicating that the message is being sent on behalf of another account. This doesn't look good, particularly in business correspondence.

In the gmail settings webpage, look for "Accounts and Import" and then "Send mail as:".

While you're looking at it, check that each of accounts 6, 8 and 9 has its own separate gmail smtp server set up in Thunderbird. If all three accounts are using the same smtp server, say the one for account 6, then messages sent using the addresses for accounts 8 or 9 as the "from:" address will also appear to be "from:" your account 6.

Thanks so muck for your answer. Take care