I think I had the same problem some months ago, when a client
complained that he wasn't able to send mail to us. Luckily their
postmaster is an adept of open source fan, so he agreed with me that
it should be another dumb thing of his Exchange, but while I didn't
comment this with anyone else less 'hardcore techie' (you know what I
mean...), I wondered if there aren't more people out there using
Exchange that aren't able to send email to us. I don't remember the
exact format of the string that caused the rejection, but I think that
the "From:" header had some "/" and or ":", "," and such.
On Fri, Jun 27, 2008 at 8:49 PM, Dan Herbon <[EMAIL PROTECTED]> wrote:
> So out of nowhere people sending email on their blackberries started getting
> the "5.1.0 - Unknown address error 571-'sorry, sender address has invalid
> format (#5.7.1 - chkuser)'" errors. I located the fix on the toaster wiki
> which basically says to add in SENDER_NOCHECK="1". Does adding this
> compromise security? What will its affects be?
>
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