Yahoo! Mail Does Not Render Anchor Tags With Encoded HREF Attributes

test-output.html

<h1>
	You've been invited to a project
</h1>

<p>
	Ben Nadel has invited you to join
	<a href="https&#x3a;&#x2f;&#x2f;projects.invisionapp.com&#x2f;path&#x2f;to&#x2f;project&#x23;&#x2f;spa&#x2f;path">My Awesome Project</a>,
	an InVision project.
</p>

test.cfm

<cfscript>

	// Setup data to be used in email-template rendering.
	project = {
		owner: "Ben Nadel",
		name: "My Awesome Project",
		url: "https://projects.invisionapp.com/path/to/project##/spa/path"
	};

</cfscript>
<cfoutput>

	<h1>
		You've been invited to a project
	</h1>

	<p>
		#encodeForHtml( project.owner )# has invited you to join
		<a href="#encodeForHtmlAttribute( project.url )#">#encodeForHtml( project.name )#</a>,
		an InVision project.
	</p>

</cfoutput>

test2-output.html

<h1>
	You've been invited to a project
</h1>

<p>
	Ben Nadel has invited you to join
	<a href="https://projects.invisionapp.com&#x2f;path&#x2f;to&#x2f;project&#x23;&#x2f;spa&#x2f;path">My Awesome Project</a>,
	an InVision project.
</p>

test2.cfm

<cfscript>

	// Setup data to be used in email-template rendering.
	project = {
		owner: "Ben Nadel",
		name: "My Awesome Project",
		url: "https://projects.invisionapp.com/path/to/project##/spa/path"
	};

</cfscript>
<cfoutput>

	<h1>
		You've been invited to a project
	</h1>

	<p>
		#encodeForHtml( project.owner )# has invited you to join
		<a href="#encodeForHrefAttribute( project.url )#">#encodeForHtml( project.name )#</a>,
		an InVision project.
	</p>

</cfoutput>
<cfscript>

	/**
	* I encoded the given value for use in an HREF attribute. This is designed to reduce
	* the amount of encoded characters so as to make the resultant value a little more
	* mail-client friendly.
	*/
	public string function encodeForHrefAttribute( required string value ) {

		var encodedValue = encodeForHtmlAttribute( value );
		// The encodeForHtmlAttribute() function will encode just about any non-alpha-
		// numeric character. Which, in most cases is completely fine. But, for Yahoo!
		// Mail, we need to back that encoding off just a bit, unencoding the protocol
		// suffix.
		var unencodedSuffix = "://";
		var encodedSuffix = encodeForHtmlAttribute( unencodedSuffix );

		// Replace the encoded protocol with the unencoded version.
		var fixedValue = encodedValue.reReplaceNoCase(
			"^([a-z0-9]+)#encodedSuffix#",
			"\1#unencodedSuffix#"
		);

		return( fixedValue );

	}

</cfscript>