John Kielkopf wrote: >S�nke Ruempler wrote: > > > >>[EMAIL PROTECTED] <> wrote on Friday, May 27, 2005 2:58 AM: >> >> >> >> >> >>>On Thu, 26 May 2005, John Kielkopf wrote: >>>=20 >>> >>> >>> >>> >>>>Have a strange problem here. >>>>=20 >>>>Users that have Norton Internet Security or Mcafee "Spam Killer" >>>>active have trouble with mail clogging up their systems from time to >>>>time. Disabling the products lets them receive the mail. >>>>=20 >>>>Although these users complain that they never had these problems with >>>>any other mail server, this doesn't seem to be an Xmail server >>>>problem. However, I'm wondering if any of you have come up with a >>>>good solution, other than telling the users to disable these >>>>products, of filtering mail that's causing these problems, and/or >>>>what exactly it is about these messages that creates this problem. >>>>=20 >>>>Here is an example of one of the messages, pulled directly from the >>>>mailbox and zipped: http://207.67.28.206/bademail.zip >>>> >>>> >>>> >>>> >>>=20 >>>It's a badly formatted MIME message (there's a '\0' towards >>>the end of the >>>message). Probably this confuses the heck out of the two junk >>>software you mentioned. >>>=20 >>>/me hides from MFE revenge >>> >>> >>> >>> >>Yes, Norton AntiSpam (Symantec crap ;) ) has this null-byte problem but >>they don't seem to care about it. Maybe other MTAs do filter nullbytes? >> >> >> >> >> >However, from RFC 821: > > "The mail data may contain any of the 128 ASCII characters. All > characters are to be delivered to the recipient's mailbox > including format effectors and other control characters." > >To me, this sounds like a null byte would fall in the "any of the 128 >ASCII characters" range. > >That said, I've sent sample messages and a description of the trouble to >Symantec and Mcafee long ago, and apparently there's still no fix -- so >I guess I'll need to come up with some sort of workaround. Does anyone >see any problems with filtering it? > > > >
Just a quick follow-up: It appears some major ISPs are checking for null bytes. See this response from a comcast server: SMTP module(domain comcast.net) reports: message text rejected by gateway-r.comcast.net: 556 null byte in data - To unsubscribe from this list: send the line "unsubscribe xmail" in the body of a message to [EMAIL PROTECTED] For general help: send the line "help" in the body of a message to [EMAIL PROTECTED]
