Scanning someone's email address is the fastest way to get people's contact details saved into your contacts.
Here is how:
When viewing the email signature on your phone, take a 'screenshot' using your phone's screenshot function
Your phone will offer you to 'edit' the screenshot - choose 'edit' and just crop the image to only show the person's email signature
On iOS: Save the image to your gallery, open your Haystack app >> tap the 'scan' button >> tap 'from gallery' and follow the prompts
On Android: Choose 'share' image >> tap 'scan with Haystack' and follow the prompts
Note: If you can't read the information in the email signature image - nor can the scanner. For best results, make sure the screenshot you send to the scanner is clear, and cropped well.