- # e.g., Message-ID: <5364-1342884222.165897@ldYMFXwUbBqKcZwg>
- id=\
-'^Message-ID: <[0-9]\{1,\}-[0-9]\{1,\}\.[0-9]\{6,6\}@[+/0-9A-Za-z]\{16,16\}'
+ # e.g., Message-ID: <5364-1342884222.165897@ldYM.FXwU.bBqK>
+ id='^Message-ID: <[0-9]\{1,\}-[0-9]\{1,\}\.[0-9]\{6,6\}@[-_0-9A-Za-z]\{4,4\}\.[-_0-9A-Za-z]\{4,4\}\.[-_0-9A-Za-z]\{4,4\}'