>Use <service>@<yourdomain> as your email address when signing up, and check the To header when receiving emails.
The user of the webservice specifies a unique email per webservice; knowledge of that unique email address serves as a hint that the email came from someone that has discovered that email address, i.e. the webservice itself.
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Here's the suggestion:
>Use <service>@<yourdomain> as your email address when signing up, and check the To header when receiving emails.
The user of the webservice specifies a unique email per webservice; knowledge of that unique email address serves as a hint that the email came from someone that has discovered that email address, i.e. the webservice itself.