It is very similar to what Mizan posted, though you would have to consider adding each other as a separate line:

So instead of Hussain, Hiba; Smith, John;

You will post it within mendeley as :

Hussain, Hiba;

Smith, John;

Dear Heba Huessin, 

Please check the attached file. you can try in this way.

It is very similar to what Mizan posted, though you would have to consider adding each other as a separate line:

So instead of Hussain, Hiba; Smith, John;

You will post it within mendeley as :

Hussain, Hiba;

Smith, John;