Quoting Harriet Bazley <lists@xxxxxxxxxxxxxxxxxxxxxxxxxxx>: [snip] > In the end, I noticed that the Message-Ids were somewhat distinctive, > obviously dictionary-generated: the 'domain' consists of a valid > dictionary word prefixed and suffixed by random single letters, e.g. > <09bb01c77506$3cff67b0$2710c5b0@pgeminatep> > <083301c77507$3ebc99c0$4826c9d0@kliftedc> > <03ff01c77404$3eda10e0$3429d3d0@aethnica> > <01dd01c77301$3eeb22c0$0165c5c0@umachinerye> I think you'll find that the left part is characteristic of being sent by Outlook, which isn't as meaningful as you'd like. It's not dictionary-generated to the extent you imagine; part of it is simply the date and time. Dave