If we understand your query correctly, you are referring to a specific form which has a button enabled in it to send the form via email as attachment? Or you are referring to the send as an Email option available in the Acrobat's menu-bar at the top?
You may check the following-
1- Make sure you have your email account set up as default within Acrobat's preferences settings.
Open Acrobat>Edit>Preferences>Email Account.
2- If it's there, then refer to the troubleshooting steps suggested here
1 1 Upvote 2 Replies 2 Adobe Employee ,/t5/acrobat-discussions/outlook-email-does-not-open-when-using-a-link-in-a-pdf-form/m-p/10323966#M132029 Feb 04, 2019 Feb 04, 2019
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If we understand your query correctly, you are referring to a specific form which has a button enabled in it to send the form via email as attachment? Or you are referring to the send as an Email option available in the Acrobat's menu-bar at the top?
You may check the following-
1- Make sure you have your email account set up as default within Acrobat's preferences settings.
Open Acrobat>Edit>Preferences>Email Account.
2- If it's there, then refer to the troubleshooting steps suggested here: Attach to email option is not working | Acrobat DC, Acrobat Reader DC
3- If everything else is working fine with the other pdf while attaching it to email. Then you may share this problematic file with us, we'll look into this.
"You can share the file with us via email. And you can send it to the email that is shared via private message. Please do mention your forum thread in the subject"