It’s no secret that Fannie Mae this year has been pushing some of its newly minted seller/servicers to use the cash window as opposed to swap MBS transactions, but the government-sponsored enterprise may be weighing an “either/or” policy. A spokesman for the GSE told Inside MBS & ABS that he has no knowledge of such a stern choice being given to Fannie customers, but he noted that the secondary market giant continues to wonder why so many new seller/servicers have MBS contracts, but do not actively issue. He said...