The best alternatives to Unmailto are I hate mailto, NoMail, and Mailto Landmines. If these 3 options don't work for you, we've listed a few more alternatives below.
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Whenever you click on an email link, this Chrome & Firefox extension will copy the email address on to your clipboard & block the email client from annoyingly interrupting you.
MailTo.ai automates the functionality of HTML mailto links. It works just like any other social share button but brings you referral traffic via emails.