Only on Outbound emails I get the following error. Just started yesterday. I've checked all the settings, etc. and everything is right. Can't figure it out. Can anybody help?
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As I understand it, Thunderbird uses the default SMTP entry for all of your email accounts. This means the SMTP settings of the default email account are used when sending mail from any of your email addresses. What are the SMTP server settings for your default account in Thunderbird?