On 11/30/2009 4:00 PM, Alex wrote:
Hi,
While the SMTP RFCs do support the "VRFY" command (which would technically
let you check whether the "FROM" address exists), probably 99% of all
servers have disabled that command to prevent spammers from abusing it to
validate their mailing lists. (See RFC 5321 section 3.5.2 and 7.3.)
I just have to ask.... Did you research that, or do you regularly
recite sections from mail RFCs on a regular basis because you've read
them so many times? :-)
Yes!
When I type in "RFC" in the Firefox address bar, RFC 5321 pops up as the
first choice. With a link to section 3.5.2 as the 2nd choice. So I
guess that's a clue that I'm having to read them too many times.
Most of the time, it's because I'm trying to get a postmaster to fix
their broken HELO/EHLO address so we don't have to whitelist them anymore.
Other times, I double-check the RFCs to see whether I'm (hopefully)
understanding things correctly and haven't overlooked something.
I've also been doing a lot of mail server tuning and configuration in
the past month, so I have RFC 5321 on the brain.
