TZUTC: -0500   
   PID: JamNNTPd/Win32 1.2.3   
   REPLYADDR ozznixon@gmail.com   
   REPLY: 1:3634/12.73 5c8be839   
   MSGID: 1:275/362.0 5c95665c   
   Found this document, which also shows using simplified UTC, and "+" is dropped:   
      
   fsc-0084.001:   
     The UTC offset of the site that generated timestamp as described above   
     is stored in the utcoffset field. Eg: if the UTC offset is -0230, the   
     utcoffset field should read, simply, -230; +0200 => 200; and so forth.   
      
      
   --    
   .. Ozz Nixon   
   ... Author ExchangeBBS (suite)   
   .... Since 1983 BBS Developer   
      
   --- FMail-W32 2.0.1.4   
    * Origin: ExchangeBBS WHQ (1:275/362.0)   
   SEEN-BY: 15/2 18/200 57/0 123/1970 153/250 154/10 203/0 221/0 226/17   
   SEEN-BY: 229/107 426 452 1014 240/5832 249/206 317 400 267/800 280/464   
   SEEN-BY: 280/5003 310/31 317/2 3 322/757 342/200 393/68 396/45 423/120   
   SEEN-BY: 633/280 770/0 1 10 100 330 340 772/0 1 210 500   
   PATH: 275/362 100 261/38 153/7715 250 770/1 280/464 229/426