I must provide a email id ex. abcd&abcd@gmail.com in mail to funcion in joomla article. It's exhibiting well however when we click this, it opens in outlook or other mail other with abcd if just discard the smoothness after &lifier.

I'm using Joomla 1.5 Editor JCE.

Use within href mailto:abc%26%40abc@gmail.com give this in text abc&abc@gmail.com

Best of luck!

Try changing the &lifier with %26, that is essentially encoding it. I believe you're encountering an html entity problem using the &lifier in play.

Best of luck!