Sounds like you forgot to change the SMTP (outgoing) server to use for the account? Check the account settings for that account. On the main page, see the Outgoing Server (SMPT) options.
Bug 1605972 Comment 7 Edit History
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Sounds like you forgot to change the SMTP (outgoing) server to use for the account? Check the account settings for that account. On the main page, see the Outgoing Server (SMTP) options.