ErcHideEmail

This will replace any email address you enter like foo@bar.org ⇒ foo at bar.org

     (add-hook 'erc-send-pre-hook 
	  (lambda (s1) 
              (setq str 
	         (replace-regexp-in-string 
                       "\\([^ \t\n]+\\)@\\([^ \t\n]+\\)" 
                       "\\1 at \\2" 
                       s1))))

ERC