Crossword clues for It's in the mail: Abbr.:PSSThey come after signatures in snail mail, yet before signatures in e-mail: Abbr.DLOPlace for undelivered mail: abbr.ATTNInteroffice mail abbr.APODestination of some mail: Abbr.RRRRegistered mail abbr.SDSCertain mail: abbr.POSCenters for mail: Abbr.LTRSMail: Abbr.SDRUser of mails: Abbr.PPDHow most goods must be ordered by mail: Abbr.RTEMail abbr.LTRSMuch mail: Abbr.RFDMail abbr.APOG.I. mail abbr.DLOPlace for unclaimed mail: Abbr.RFDFormer farm mail abbr.PPDLike business reply mail: Abbr.DLODept. for unclaimed mail: Abbr.RSOTrain mail abbr.APOMail abbr.GPOMail abbr.RFDObsolescent mail abbr.DLOPlace for undeliverable mail: Abbr.FWDPass along, as an e-mail: Abbr.INVBookkeeper's mailing: Abbr.APOSThey sort military mail: Abbr.LTRPiece of mail (abbr.)APOPlace for a GI's mail (abbr.)RFDFarmland mail abbr.LTRBit of mail: Abbr.MSGSBits of e-mail: Abbr.APOMilitary mail abbr.ENCDirect mail abbr.APOAir Force mail abbr.ENCIt's in the mail: Abbr.MSGSE-mail (abbr.)BCCSecretive e-mail abbr.POBContainer for mail: Abbr.MSSEditors' mail (abbr.)RFDCountry mail abbr.FTDFlowers by mail: abbr.MSGSVoice mails: Abbr.ENCCheck in the mail: Abbr.REGLike some mail: Abbr.CERTLike some mail: Abbr.REGDKind of mail: Abbr.ENCThe check that's in the mail?: Abbr.RFDFarm mail abbr.MSGSE-mails (abbr.)APRWhen the IRS gets a lot of mail (Abbr.)