On 09/15/2010 06:33 AM, Frank Doege wrote:
On 09/15/2010 01:47 AM, Jeroen Geilman wrote:
On 09/14/2010 12:13 PM, Frank Doege wrote:
Hi all,
id like to modify the message postfix sends to the server when it
rejects an email in one of the checks performed.
For example,
450 Helo command rejected: Host not found; http://readhereforemore.info
Any check_*_access map can return an error code and a custom reply
message.
A restriction class can, too.
that administrators which have no clue about email systems have a bit
more information why iam rejecting there mail.
does this make sense ?
Btw: I use tumgreyspf and it also sends a custom dsn message, is this
non standard conform in any way ?
I don't understand what you mean by "custom DSN".
A DSN is a normal email message, its contents aren't written down
anywhere.
There is an RFC about them, however.
Thanks
Frank
Hello Jeroen,
thanks for your answer.
The problem is the following, i see some legitimate mail beeing
rejected by my mailserver because some other administrators are not
capable of setting the name of their mailserver right (helo doesnt has
an A record for example).
That is alas still quite common, and postfix has a variety of ways to
deal with this.
It seems to be the general consensus that you can freely reject mail
when the HELO is invalid or not in f.q.d.n.com form; rejecting on an
unkown HELO hostname is often too restrictive, however, as many people
report issues with that.
I prefer to run all three HELO checks with warn_if_reject, so the
actions are logged but no action is taken.
Now i think its just fine to reject this mail instead of accepting
such mailservers, i would however like to give a small note why iam
rejecting there mail. These administrators cant configure a mail
server right so i dont think they understand "helo command
rejected..." so id like to add a link where they can find more
information.
You could use a policy service to act upon this using check_policy_service.
If iam right the sender receives a message from the server beeing
rejected after several trys in the form of "iam giving up now, ...."
As you can see from the example you posted above, an unknown HELO
hostname causes a temporary reject (code 450).
Mail is only deferred (and retried) after the message was queued, and
smtpd_* checks are run before a message is accepted.
there i would like that he sees a custom link http://whyismymailrejected
Maybe if many users are asking why there mail didnt got delivered they
wake up and fix there servers.
Thanks,
Frank
