Yesterday, someone reported to me that she was unable to send a document she had scanned from within Adobe Acrobat using Thunderbird, which is the email client she uses on her Microsoft Windows 10 desktop system. She said she had contacted Adobe support and followed the instructions given to her by the support person, but those instructions had not resolved the problem and she still could not send email from within Adobe Acrobat. I found the problem was due to Acrobat attempting to use the default mail application on the system, which was Microsoft Outlook, which she didn't use, so was likely not even configured for an email account. After I made Thunderbird the default mail application on her system, she was able to send a file she had open in Acrobat via email from within Adobe Acrobat using Thunderbird.
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