hugo-theme-lowtech/layouts/partials/contact/mail.html

{{- with .Site.Data.contact.mail -}}
{{- $protocol := "mailto" -}}
{{- $mail := . -}}
{{- $mailWithProtocol := print $protocol ":" . -}}
<a
  class="mail obfuscate"
  data-link="{{ range $index := seq (sub (len $mailWithProtocol) 1) 0}}{{ substr $mailWithProtocol $index 1}}{{ end }}"
>{{ range $index := seq (sub (len $mail) 1) 0}}{{ substr $mail $index 1}}{{ end }}</a>
{{- end -}}