cannot add a recipient to email in acrobat reader xi

Thunderbird — Release Notes (60.5.3) — Mozilla

NEWS FLASH:   Go to Thunderbird's Help menu, and check for an update. I just updated my TB, then it restarted, and the issue with attaching a PDF to an email has gone away.   

Current version of Thunderbird is now at 60.5.3.

i have also just last week started experiencing this same problem. i'm on WIndows 10, newest Adobe Acrobat DC, and current Thunderbird release.

when you attempt t to send via default email application, this error appears. i regularly use this function and have for a couple years -- and now it has ceased to work.

I too just started having this same issue happen. Everything had been working for years without issue. It may have something to do with an update either of the operating system, or of the email client.

Theodore, what email client are you using?

I'm using Windows 7 Pro, with Adobe Acrobat 9 Pro, and Thunderbird 60.5.2.

NOTES

• I have tried the "Repair Acrobat Installation" under the Help menu, and rebooted. It did not help. I'm still having the same issue.
• The issue described is the same as opening a pdf, then from the File menu, select "Attach to Email..."
• The same issue occurs both trying to attach local or network stored pdf's.

when you press the email icon "a specified recipient type is invalid" pops up and one can only press ok.  email will not come up.

Please provide more details. Your description of the issue is very vague.