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Since yesterday i have some problems with your Thunderbird extension.
For each mail i receive, sender verification shows:

Error: Could not get SPF info: DNS server occams.info:9053 refused a TCP connection

Is there any idea what has happened?

Regards
Michael

Questa recensione riguarda una versione precedente (0.9.0.1) del componente aggiuntivo. 

This was fixed shortly after the review was submitted. Clearly bug reports are best sent to the developer directly (unless they aren't fixed)!