Address verification in progress

I could not find in postconf if there is a way to increase a timeout
for Address verification that makes
"Sender address rejected: unverified address: Address verification in
progress;" instantly on a slow network. I know, the mail will be
accepted at the other MTA's try, but it's bad solution for me :-( . So,
is there a way just to increase timeout? Thanks!

codeguard@gmail.com wrote:
> I could not find in postconf if there is a way to increase a timeout
> for Address verification that makes
> "Sender address rejected: unverified address: Address verification in
> progress;" instantly on a slow network. I know, the mail will be
> accepted at the other MTA's try, but it's bad solution for me :-( . So,
> is there a way just to increase timeout? Thanks!

Well, you knew the risks:

http://www.postfix.org/ADDRESS_VERIF...ml#limitations

What machine do you probe for address verification?
If it's an Exchange machine, you should probably go for LDAP queries (with
local query cache) or regular exports from Exchange and put them in your
postfix config. The latter will work for other machines as well.

Peter

--
http://www.boosten.org

Mail: peter at boosten dot org

"""Peter Boosten ÐÉÓÁÌ(Á):
"""
> codeguard@gmail.com wrote:
> > I could not find in postconf if there is a way to increase a timeout
> > for Address verification that makes
> > "Sender address rejected: unverified address: Address verification in
> > progress;" instantly on a slow network. I know, the mail will be
> > accepted at the other MTA's try, but it's bad solution for me :-( . So,
> > is there a way just to increase timeout? Thanks!
> Well, you knew the risks:
> http://www.postfix.org/ADDRESS_VERIF...ml#limitations

Yes, I've already read this man. But where is the timeout value? ;-) I
could find only a DELAY:
address_verify_poll_delay = 10s
And I set it to 10 seconds. Where could I find the _maximum_ delay,
this just sends query and stops smtpd for 10 seconds.

> What machine do you probe for address verification?
> If it's an Exchange machine, you should probably go for LDAP queries (with
> local query cache) or regular exports from Exchange and put them in your
> postfix config. The latter will work for other machines as well.

I probe sender's server, this could be any MTA in the world, so ldap is
not applicable ;-) As I say, my only need is timeout, because at this
net we have only fully loaded 115 kbit/s network on async modem, with
poor line quality :-)

Thank you for your reply.

Peter Boosten wrote:

> I don't think address verification was meant for this: it's the receiving
> MTA's job to verify if recipients exist or not.


As I read it, he's trying to use the sender verification feature, rather
than the recipient verification:

http://www.postfix.org/ADDRESS_VERIF...#forged_sender

and seeing problems because of a slow Internet connection.

--
Greg

Codeguard <codeguard@gmail.com> wrote:
>
> I probe sender's server, this could be any MTA in the world, so ldap is
> not applicable ;-) As I say, my only need is timeout, because at this
> net we have only fully loaded 115 kbit/s network on async modem, with
> poor line quality :-)
>

I don't think address verification was meant for this: it's the receiving
MTA's job to verify if recipients exist or not.

These probes might get you on a blacklist.

We use address verification because our postfix relays to an Exchange-box,
our postfix has no idea what users might exist on our Exchange. This prevents
unnecessary NDRs or messages hanging in the queue.

Peter

--
http://www.boosten.org

Mail: peter at boosten dot org

Greg Hackney <hackney@swbell.net> wrote:
> Peter Boosten wrote:
>
>> I don't think address verification was meant for this: it's the receiving
>> MTA's job to verify if recipients exist or not.
>
>
> As I read it, he's trying to use the sender verification feature, rather
> than the recipient verification:
>
> http://www.postfix.org/ADDRESS_VERIF...#forged_sender
>
> and seeing problems because of a slow Internet connection.
>

You're right. I overlooked one word :-s

Peter

--
http://www.boosten.org

Mail: peter at boosten dot org