Paolo Cravero as2594 wrote: > Hi. > I just received a spam of which I copy here a part of headers. It > slipped though a postfix+SA2.62 installation (basic SA with Bayes). > > What surprises me is the presence of X-UIDL header in a SMTP envelope. > Moreover the X-UIDL value is non-numeric! Has anyone blocked this > thing? Any special rule? (I can write my own if there's none around) > Any reason why it is there?!
Hello, In the cases where I have seen X-UIDL, it's placed by the receiving server not the sending server. In my case it's used by my web e-mail system to identify a mail message with a unique string. It's normally the Message-ID before the @ sign for me, but I'm sure everyone does things their own way. I've seen the X-UIDL being funny characters like you show, but I never tried a rule for it.
