I\'ve tried to figure out whether the format of an e-mail address can be said to comply with the definition of a URI or not, but I\'ve found no explicit confirmation of this so
Yes, but with "mailto:" prefix.
A URI has this form:
<scheme>:<scheme-specific-part>
The <scheme> is "mailto", the <scheme-specific-part> is the address.
<scheme>
<scheme-specific-part>
For example:
mailto:max@provider.com
is a valid URI.