[lkml]   [2003]   [Sep]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
> > I'm running my own mailserver and it's hard not to accept it.  I have
> > basically done checks in the from and to headers. If it appears as a virus,
> > i lockout the smtp sender. It's not permenant. When the virus stops, i
> > unblock every one.
> I've noticed that they *ALL* have their From:, To:, and Subject: written in
> uppercase. So it's really easy to filter them out depending on the tools used.
> If a mail header either matches ^FROM:, ^TO: or ^SUBJECT: then it has high
> chances to be a spam/virus. I checked all my recent mails and a few months
> back in LKML and did not found anything except spam/viruses which match this.
> At least, we should be lucky that these virus writers don't fully respect
> protocols...

What protocols are you referring to?

RFC 822, section 3.4.7, makes clear that case is _not_ significant for
these field names. RFC 2822 doesn't change this.

Just because no commonly used E-Mail application seems to generate
uppercase field names, how do you know something like a password
auto-responder script won't?

That may not be a concern for you, but please don't spread
mis-information to others.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:48    [W:0.025 / U:12.620 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site