right click your account in the folder pane and select settings. In the outgoing servers (SMTP) entry in the account setting dialog (it is the last entry in the list) Select the entry then select the server you want to be the default. Click the set default button. Restart Thunderbird.

You are done.

Thanks, Matt, but the "Yahoo! Mail - smtp.mail.yahoo.com" account was already marked as "Default". I switched momentarily to Google mail as Default, then returned the Default designation to the Yahoo listing, and restarted. To no avail.

I think you need to set the incoming (yahoo) account as your default. That will set the account used when composing a message, so long as some other factor doesn't override it. For instance, if you are in a folder in your gmail account, a new message would be set up using the gmail address. The default account is particularly significant when using a mailto: (or send to) link where the "from:" address to use is not specified.

There are many add-ons to help with choosing the identity to be used when sending or composing a message. (How many of these will survive the transition to TB 60 is yet to be seen.) Look at Correct Identity, Identity Chooser, Folder Accounts etc.

It's quite easy to set an account as the default, but if you need to re-order your accounts, or change the presentation (you might want Local Folders shown first), try the Manually Sort Folders add-on.

I'm sorry. Nothing against any of you volunteers. But I no longer have time to be a guinea pig. I think that this is a problem which Mozilla must solve. It appears obvious to me that Google has once again invaded an area that it has no business getting into and is making work for everyone else. Good luck in fighting this hydra.

If you really need help then...

re : If I open an email in my Yahoo main folder (ie, islandee00@yahoo.com), and select "Reply", I get an email form with the "From" filled in with "islandee00@yahoo.com". You get that email address in From because the email is in a folder in that mail account. The 'From' may well say yahoo, but it does not tell us which outgoing server is really sending using that yahoo email address.

• Right click on yahoo mail account name in Folder pane and select 'Settings'
• 'Account Settings' window opens on that yahoo account name.
• Look bottom right for the designated outgoing server.
• Does it say the Outgoing server (SMTP) is using the yahoo server?

See first image as guide.

• If no then you need to select the yahoo outgoing server.

Note: you can edit the Outgoing Server (SMTP) Description field to help identify an outgoing server more easily. - see second image below.

• Click on 'OK'

Please confirm the yahoo account really is desgnated to use the yahoo outgoing server when it is sending emails.

As far as I'm concerned, you're going in circles. All this has been done, long ago, and it isn't working.

Sorry, as I say, I just don't have time to be a test bench.

re :As far as I'm concerned, you're going in circles.

No wonder it appears that way to you because you are not providing requested information for others to understand the situation on your computer. However, each question or suggestion is different and relates to separate things that could be causing this. It would appear you do not understand this.

Understand that it is you who need to provide requested information.

At the very least you could provide the following: In Thunderbird

• Help > Troubleshooting Information
• click on 'Copy text to clipboard' button
• In this forum question, right click in a post a reply text box and select Paste'.

Then tell us which mail account name is listed at the top of the 'Account Settings' window. Is it yahoo or gmail?