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OK, finally reproduced. The mentioned line 729 is innocent, and really AbstractBuild as a whole is doing nothing wrong; nor, as far as I can tell, are the Mailer or Mercurial plugins.
The problem (as I surmised on Sep 16) is in User itself. When you run a build that fails, and it has a changelog mentioning at least one user with full name & email address who does not yet have any permanent record in $JENKINS_HOME/users/$id/config.xml, the build stores a culprits field listing the user’s ID, which correctly includes underscores. So long as Jenkins remains running, the loaded User object is fine, and mailing would work. However if you restart Jenkins, and then run a new build that again fails, but with no changelog this time, getCulprits inherits the culprits list from the previous build. This time User.get(id) is called and since there is no persistent record for that user, there is no way of reconstructing the proper fullName—we only have the sanitized ID. Therefore the User is constructed with a bogus fullName and mailing fails.
Looking into a fix.