I have set up a default email (tools>>account settings) which is different from my gmail and yet every time I reply to an email it gets send from the gmail acc.

Yes the default Outgoing Server (SMTP) is set up to the default account not to gmail. And it still sends email from the gmail when I reply.

Also on my gmail account I have that other email address setup as default.

Any other suggestions?

Thank you, Zaya

Application Basics

   Name: Thunderbird
   Version: 52.6.0
   User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:52.0) Gecko/20100101 Thunderbird/52.6.0
   Profile Folder: Show in Finder
   Application Build ID: 20180123185941
   Enabled Plugins: about:plugins
   Build Configuration: about:buildconfig
   Memory Use: about:memory
   Profiles: about:profiles

 Mail and News Accounts
   account1:
     INCOMING: account1, , (imap) c17004.sgvps.net:993, SSL, passwordCleartext
     OUTGOING: , c17004.sgvps.net:465, SSL, passwordCleartext, true

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

   account3:
     INCOMING: account3, , (imap) c17004.sgvps.net:993, SSL, passwordCleartext
     OUTGOING: , c17004.sgvps.net:465, SSL, passwordCleartext, true

   account4:
     INCOMING: account4, , (pop3) pop-mail.outlook.com:995, SSL, passwordCleartext
     OUTGOING: , smtp-mail.outlook.com:587, alwaysSTARTTLS, passwordCleartext, true

   account5:
     INCOMING: account5, , (imap) imap.gmail.com:993, SSL, OAuth2
     OUTGOING: , c17004.sgvps.net:465, SSL, passwordCleartext, true

 Crash Reports

 Extensions
   Lightning, 5.4.6, true, {e2fda1a4-762b-4020-b5ad-a41df1933103}
   Provider for Google Calendar, 3.3, true, {a62ef8ec-5fdc-40c2-873c-223b8a6925cc}

 Important Modified Preferences

   Name: Value

     accessibility.typeaheadfind.flashBar: 0
     browser.cache.disk.capacity: 358400
     browser.cache.disk.filesystem_reported: 1
     extensions.lastAppVersion: 52.6.0
     font.internaluseonly.changed: false
     font.name.sans-serif.x-western: Calibri
     font.size.variable.x-western: 13
     mail.openMessageBehavior.version: 1
     mail.spotlight.firstRunDone: true
     mailnews.database.global.datastore.id: 7e27a3ad-0d72-8349-b3f2-8cedce71529
     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: 1518916383
     places.history.expiration.transient_current_max_pages: 122334
     security.sandbox.content.tempDirSuffix: {69908548-60a1-4147-8e80-2bd1e4b24759}

 Graphics

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

     Features
     WebGL Renderer: NVIDIA Corporation -- NVIDIA GeForce GT 650M OpenGL Engine -- 2.1 NVIDIA-10.10.14 310.42.25f02

     AzureCanvasBackend: skia
     AzureCanvasAccelerated: 0
     AzureFallbackCanvasBackend: none
     AzureContentBackend: skia
     TileHeight: 1024
     TileWidth: 1024

 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

thank you. I did add the smtp.gmail.com but it doesn't matter which smtp send as long as I have in the From field the default email account. Which is still not the case when I reply to an email, but it is the case when I compose an email.

thank you for trying to help with this issue.

maybe the problem is with the sgvps server?