TID: Mystic BBS 1.12 A47   
   MSGID: 1:129/215 34f78189   
   REPLY: 1:229/664 517486ae   
   TZUTC: -0400   
    JH> Here are two more than came through today.  I've turned off my feeds to   
    JH> 2:221/6 & 3:770/1 for now and am just hooked up to 1:229/426:   
    JH>    
    JH> https://paste.ee/p/hBhCR   
    JH>    
    JH> https://paste.ee/p/nN9aV   
    JH>    
    JH> Again, the kludges look the same (except for the path and seen-by lines)   
    JH> but the message body has again been modified.  One message has a SLMR   
    JH> line where the other one doesn't.   
      
   The short answer to your messages here is: These are not considered duplicate   
   messages as the message content is different.  But I'll explain a little more   
   detail for you if you're interested:   
      
   Mystic doesn't only rely on MSGID because some software or messages/networks   
   may not use them at all.  Instead, Mystic takes all things into consideration   
   in totality which includes: MSGID, actual message content, PATH addresses (to   
   prevent importing circular distributed messages) and SEEN-BY (to prevent   
   distributing circular exported packets).   
      
   As you noted these messages aren't really duplicates because the message   
   content is different and Mystic knows this (despite what the MSGID alone   
   says). Because it knows they aren't the same, it doesn't treat it as a   
   duplicate.   
      
   I can understand why some may think a duplicate MSGID alone would/should be   
   enough, but legacy software (especially in the art scene where Mystic was   
   popular) didn't use them at all and other prominent software (like EleBBS I   
   remember testing, among others) were prone to spitting out two completely   
   different messages with the same MSGID in the same echo.   
      
   As a result of all of that Mystic looks at everything and will not block a   
   message unless its very confident that it truly is a duplicate message.  In   
   your case those messages are not duplicates in message content.   
      
   ... Fer sell cheep: BBS spel chekker. Wurks grate.   
   --- Mystic BBS v1.12 A47 2021/09/23 (Windows/64)   
    * Origin: Sector 7 * Mystic WHQ (1:129/215)   
   SEEN-BY: 1/123 30/0 80/1 90/1 103/705 105/81 120/340 457 616 123/10   
   SEEN-BY: 123/131 129/215 305 154/10 30 40 50 700 203/0 218/700 220/80   
   SEEN-BY: 220/90 221/1 6 226/18 30 227/114 201 702 229/310 424 426   
   SEEN-BY: 229/428 452 550 664 700 981 240/1120 5832 249/206 307 317   
   SEEN-BY: 249/400 261/38 280/464 282/464 1038 292/854 301/0 1 101 113   
   SEEN-BY: 317/3 322/757 335/364 341/66 342/200 633/280 712/848 770/1   
   SEEN-BY: 920/1 3634/12 5020/1042 5058/104   
   PATH: 129/215 154/10 301/1 229/426