[opendmarc-users] Unable to parse From header field

[Scott Kitterman]

On Wednesday, May 20, 2015 10:26:13 PM A. Schulze wrote:
> Murray S. Kucherawy:
> > I would imagine the idea here is that some other component of your
> > mail system would identify such a message as clearly bogus and
> > reject it, independent of DMARC.
> > 
> > What do others think?  We could easily add an option that will cause
> > OpenDMARC to request rejection of messages where From is unparseable.
> 
> it would help.
> at least postfix has currently no easy option to enforce a valid
> RFC5322.From postfix could check headers but enforcing strict syntax would
> require complex regex I guess.
> 
> I would love to see a milter that sould do this job.
> But I have a strong requirement: whitelisting!
> 
> It must be possible to whitelist invalid From lines or clients.
> For example by ip, cidr or rdns.

Assuming it's common for RFC5322.From to be munged in unfortunate ways, it 
might be good for opendmarc to not limit itself to strict interpretation of 
RFC5322.From and work a little harder to extract a domain from the mail.  That 
would make false positives less likely.

Scott K