You can do it, but you'll run into unexpected problems. For instance, my boss accesses Exchange from OSX. The client he uses spontaneously sets the headers to Asian character sets at times. It was _not_ good that my Postfix header checks were bouncing his mail back to him then. I've also seen some bulletin boards, where the language is English, nonetheless send ISO headers in, for instance, their confirmation emails. Also not good.
Whit On Sat, Oct 29, 2011 at 02:42:34PM -0400, Pat wrote: > Is there a way to detect non-7bit headers such that they can be flagged for > post-queue filtering? Postfix' header_checks (with or without PCRE) would be > ideal > but I'd like to know if this is doable in Spamassassin or Amavisd-new as well. > > Before I get labeled an ASCII bigot the problem is security. Certain smart > phones > are susceptible to viruses and trojans passed via non-ASCII email headers. > Javascript seems to be the language of choice for these exploits but it is > not the > only way to target email clients. The main problem is that no smartphones > are yet > designed with good security. A secondary problem is the sending of non-RFC > compliant 7 bit clean headers. My preferred solution would be tagging for > evaluation but a web search has turned up nothing straightforward. > > Pat
