https://bz.apache.org/SpamAssassin/show_bug.cgi?id=7635
--- Comment #12 from Henrik Krohns <apa...@hege.li> --- Consider using (?:\s|^)([13][a-km-zA-HJ-NP-Z1-9]{25,34})(?:\s|$) It practically eliminates all matches from my ham corpus. And previous spam runs were also pretty much whitespace delimited. It's just a silly game of whackamole.. I vote +1 if you use my safe one to reduce unneeded DNS queries.. -- You are receiving this mail because: You are the assignee for the bug.