Search function is broken

It seems that YAMs search function is broken because it
find no string which are in the header of a mail.

Step by step to reproduce:

1. Import the attached mail 'mail.eml'. (This is a mail i get from Thore but i edit the mail and delete the private data and change the text in the mail body. But the same happen with real received mails too.)
2. If the mail is in your inbox click the button 'find'.
3. Select in 'Search in' 'Message headers' or 'Whole message'.
4. Be sure '=' is selected from the drop down menu.
5. Into the textfield type for example '127'
6. Click 'Start search'

IMHO YAM should find the string in the mail but YAM doesn't
return any match. The same happen if try different search
strings which are in the header e.g 'xxx' 'Tester' etc.
I try also ADos search patterns e.g. '#?127#?' or '#?Tester#?'
without success.

Do i anything wrong or is the search function is really broken?

Used version YAM 2.6p1 [OS3/m68k] (14.09.2010)

BTW: The same happen with the new search function in YAM 2.7.