Direct Solution  – Users can use the Webbyacad MBOX Converter Wizard which allows you to export MBOX email in multiple file formats, such as PST, MSG, EML, PDF, HTML etc. It can also act as a MBOX to RTF Converter as it comes with a unique storage option.  Free Trial  – MBOX to RTF Converter is available with a free demo version to help users understand the functionality of this utility without investing. Free MBOX to RTF Converter can export the first 25 emails from any MBOX

Summary:  Thunderbird is a widely used application for managing mailbox content. Users frequently encounter Thunderbird SMTP error, cannot send message which can restrict their functionality. Below are some strategies to help you fix this error. If this error persists, you should consider migrating to another mailbox such as Outlook. In order to easily migrate your emails from Thunderbird, you should access the PST tool with the help of professional software like Webbyacad M