import into PDF form email adresses

A folder level automation script can be created to read an external text file, such as CSV, which can be easily expported from excel. Alternatively, an Excel VBA macro can be created to update a PDF directly from data on a spreadsheed. 

These article might be helpful. 

https://www.pdfscripting.com/public/Automating-Acrobat.cfm

Not with an Excel file, no. A script can be used to read an external text file and then parse it, though.

You can create a PDF form, and use the Tracker (About Forms Tracker (adobe.com)) to distribute it.

• Create the form with the fields you need
• View > Tracker
• Distribute a form
• Selct your form > Next
• Manual collection > Next 
• Send Using Acrobat > Next
• Click on the To... button to select your distribution list (or paste the email; email2; email3;... (I create these in MS Word replacing the return by ; for example)
• OR Send using Outlook, the pdf is stored locally and use your email Distribution List
• Send

Users can use a central location to save their forms, can click on a button you set up to send it back, use their email to reply to your original message...

You can also use similar options with an online form from https://acrobat.adobe.com/

Users can fill it using Acrobat reader or a web browser (I think).