Thunderbird - mails
I can receive mails - but not send mails An error occurred while sending mail: Outgoing server (SMTP) error. The server responded: Service unavailable. Client host 80.208.65.43 rejected for spamming issues. Client Address 80.208.65.43 block for spam incident; http://www.spamhaus.org/query/bl?ip=80.208.65.43 Service unavailable. Client host 80.208.65.43 rejected for spamming issues. Client Address 80.208.65.43 block for spam incident; http://www.spamhaus.org/query/bl?ip=80.208.65.43.
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That website lists two errors for you. One applies if you run your own email server, and the other should be reviewed with your email provider. A possibility may be that your SMTP server is misconfigured. Posting a screenshot of that may help someone here propose changes to it.