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TB keeps changing the email address for my smtp server

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I have TB accounts setup for email from three different domains. Let's call them A.com, B.org, and C.net. All three domains are hosted at the same ISP - Ionos. Therefore all three have the same SMTP server for outgoing emails - smtp.ionos.com. But each has a different mailbox with different email address, so when I set up the accounts in TB I specify smtp.ionos.com as the email server along with the email address appropriate to that domain: [email protected], [email protected], and [email protected]. The problem is that when I set the email address for one of these accounts TB changes the other two accounts to match it. So, for instance, the email address for all three accounts' SMTP server ends up being [email protected]. Then, of course, each time I use a different account to send email I have to go back in and change the email address and reenter the PW for that account. How can I stop TB from changing all three accounts and get it to keep the appropriate email address with the right account?

I have TB accounts setup for email from three different domains. Let's call them A.com, B.org, and C.net. All three domains are hosted at the same ISP - Ionos. Therefore all three have the same SMTP server for outgoing emails - smtp.ionos.com. But each has a different mailbox with different email address, so when I set up the accounts in TB I specify smtp.ionos.com as the email server along with the email address appropriate to that domain: [email protected], [email protected], and [email protected]. The problem is that when I set the email address for one of these accounts TB changes the other two accounts to match it. So, for instance, the email address for all three accounts' SMTP server ends up being [email protected]. Then, of course, each time I use a different account to send email I have to go back in and change the email address and reenter the PW for that account. How can I stop TB from changing all three accounts and get it to keep the appropriate email address with the right account?

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This problem is caused by Thunderbird reusing existing outgoing server settings that may already exist for the same server (but different username) when setting up a new account. It doesn't tell you those settings are being shared across multiple accounts nor gives you the option to create new separate outgoing server settings specific to the new account during the account setup process, and hence you end up changing the outgoing server settings for all the accounts sharing those settings every time you change the settings for one of the accounts…

You may create and manage multiple outgoing server settings for the same server, but cannot do it from within the main account settings. You have to do that from a separate Outgoing Server (SMTP) Settings pane you may open by selecting the corresponding option at the bottom of the list of accounts in Account Settings. The following article has a screenshot that shows the SMTP settings pane:

https://support.mozilla.org/kb/cannot-send-messages

You can add there as many settings for the same outgoing server as you want, with each entry having its own username, and then assign the right outgoing server settings to each account in the main account settings.

Alterado por DavidGG em