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<a href="mailto:name<emailid@domain.com>?subject=Complaint Form&body=Please describe your complaint here.">Complaint Form</a>
me
<a href="mailto:name<emailid@domain.com>?subject=Complaint Form&body=Please describe your complaint here.">Complaint Form</a>
<a href="mailto:name%3Cemailid@domain.com%3E?subject=Complaint Form&body=Please describe your complaint here.">Complaint Form</a>
It will all depend on the client, however.