In Mozilla Thunderbird you can define outgoing (SMTP) servers separately from incoming ones. So e.g. if there’s a server you wanna send mail through, but never poll it for incoming mail, you can do that.
How can I do that in K-9 Mail?
This is currently not supported in K-9 Mail. The relevant feature request is here: https://github.com/k9mail/k-9/issues/1117
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