Lead email

PLease find the below code for same, where you can change for same condition and proceed accordingly.

UTrigger on Lead (before insert, before update)
		   {
			list<Task> lsLeadToInsert = new list<Task>();
				if(trigger.isInsert() && Trigger.isAfter())
				{
						for(lead objlead : trigger.newmap)
						{
						      if(objlead.email != trigger.oldmap.get(objlead.Id).email)
							  {
								 Lead objLead = new Lead();
								 objLead.status = '';//or qassign any value which you wnat to set and then insert
								 lsLeadToInsert.add(objLead);
							  }
							  else
							  {
							       //then do whatever you want to update on same insteance
							  }
						}
						insert lsLeadToInsert
				}
		   }

Thanks,

Sandeep