DSN 4.4.2? conversation ... timed out while sending?

I run my own postfix mail server and have a static IP address
with my ISP. I can send email to almost anyone and not have a
problem, but when I try to send emails to friends that have
bigpond email addresses I get these sort of error
message/bounces:

Apr 28 16:34:43 piggo postfix/error[18053]: 1844A271A004:
to=<XYZ@bigpond.net.au>, relay=none, delay=0.03,
delays=0.02/0/0/0.01, dsn=4.4.2, status=deferred (delivery
temporarily suspended: conversation with
extmail.bpbb.bigpond.com[61.9.189.122] timed out while sending
message body)

This has been happening for a few months now. I can only assume
that bigpond is blocking my IP address range, probably in some
misguided attempt to stop spam.

Is there any way for me to adjust postfix settings so it doesn't
timeout? Or is this a setting at their end and I can't do
anything about it?

--
Troy Piggins

On Tue, 28 Apr 2009 16:55:05 +1000, Troy Piggins wrote:

> I run my own postfix mail server and have a static IP address with my
> ISP. I can send email to almost anyone and not have a problem, but when
> I try to send emails to friends that have bigpond email addresses I get
> these sort of error message/bounces:
>
> Apr 28 16:34:43 piggo postfix/error[18053]: 1844A271A004:
> to=<XYZ@bigpond.net.au>, relay=none, delay=0.03, delays=0.02/0/0/0.01,
> dsn=4.4.2, status=deferred (delivery temporarily suspended: conversation
> with extmail.bpbb.bigpond.com[61.9.189.122] timed out while sending
> message body)
>
> This has been happening for a few months now. I can only assume that
> bigpond is blocking my IP address range, probably in some misguided
> attempt to stop spam.
>
Does this happen every time you send mail to a particular address?

Does the mail eventually (after an hour or two) get delivered?

> Is there any way for me to adjust postfix settings so it doesn't
> timeout? Or is this a setting at their end and I can't do anything
> about it?
>
Is your configured timeout particularly short?


--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |

* Martin Gregorie wrote :
> On Tue, 28 Apr 2009 16:55:05 +1000, Troy Piggins wrote:
>
> [---=| Quote block shrinked by t-prot: 10 lines snipped |=---]
>>
>> This has been happening for a few months now. I can only assume that
>> bigpond is blocking my IP address range, probably in some misguided
>> attempt to stop spam.
>
> Does this happen every time you send mail to a particular address?

Not just a particular address. Every time I send mail to anyone
at bigpond.net.au - my parents, my aunty, and several friends.
Bigpond is probably the largest ISP in Australia.

> Does the mail eventually (after an hour or two) get delivered?

No. My server keeps trying, then eventually I'll get a failed
notice.

>> Is there any way for me to adjust postfix settings so it doesn't
>> timeout? Or is this a setting at their end and I can't do anything
>> about it?
>
> Is your configured timeout particularly short?

I haven't configured it, so it's just the default I guess.
Ubuntu distro. Is smtp_connect_timeout the relevant one?
Default is 30s. Or is it one of the smtp_data_... ones?
So many timeouts, sorry.

--
Troy Piggins

Troy Piggins wrote:
> I run my own postfix mail server and have a static IP address
> with my ISP. I can send email to almost anyone and not have a
> problem, but when I try to send emails to friends that have
> bigpond email addresses I get these sort of error
> message/bounces:
>
> Apr 28 16:34:43 piggo postfix/error[18053]: 1844A271A004:
> to=<XYZ@bigpond.net.au>, relay=none, delay=0.03,
> delays=0.02/0/0/0.01, dsn=4.4.2, status=deferred (delivery
> temporarily suspended: conversation with
> extmail.bpbb.bigpond.com[61.9.189.122] timed out while sending
> message body)
>
> This has been happening for a few months now. I can only assume
> that bigpond is blocking my IP address range, probably in some
> misguided attempt to stop spam.
>
Bigpong may be blocking you because when they do a reverse lookup on the
originating IP they are getting an ISP-related name (something like
"1234-dial-up.isp.com.au", not a *real* domain, even if you do have a
domain name tied to your IP with MX records and all that.

Most likely, however, is that Bigpong have blocked all of iiNet's IP
addresses except for their mail servers.

A simple work around is to relay all mail via your ISP, frex my main.cf
has "relayhost = [mail.tpg.com.au]" and everything gets through fine, now.

Cheers,
Gary B-)

On Tue, 28 Apr 2009 21:42:28 +1000, Troy Piggins wrote:

> * Martin Gregorie wrote :
>> On Tue, 28 Apr 2009 16:55:05 +1000, Troy Piggins wrote:
>>
>> [---=| Quote block shrinked by t-prot: 10 lines snipped |=---]
>>>
>>> This has been happening for a few months now. I can only assume that
>>> bigpond is blocking my IP address range, probably in some misguided
>>> attempt to stop spam.
>>
>> Does this happen every time you send mail to a particular address?
>
> Not just a particular address. Every time I send mail to anyone at
> bigpond.net.au - my parents, my aunty, and several friends. Bigpond is
> probably the largest ISP in Australia.
>
OK

> No. My server keeps trying, then eventually I'll get a failed notice.
>
OK

> I haven't configured it, so it's just the default I guess. Ubuntu
> distro. Is smtp_connect_timeout the relevant one? Default is 30s.
OK

I was wondering if Bigpond had turned on greylisting. My ISP did a couple
of months back. Mail does get delayed by it between a few minutes and a
hour or so but it works - pre-greylist 70% of my incoming mail was spam.
Now only 7% is.

I agree with Gary - since most spambots send direct from the infected PC
its very common for all an ISP's IP range to be blacklisted apart from
its mail servers. Like him, my Postfix MTA has always been configured to
send through my ISP's mailserver with a 'relayhost' directive.


--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |

* Gary R. Schmidt wrote :
> Troy Piggins wrote:
> [---=| Quote block shrinked by t-prot: 12 lines snipped |=---]
>>
>> This has been happening for a few months now. I can only assume
>> that bigpond is blocking my IP address range, probably in some
>> misguided attempt to stop spam.
>>
> Bigpong may be blocking you because when they do a reverse lookup on the
> originating IP they are getting an ISP-related name (something like
> "1234-dial-up.isp.com.au", not a *real* domain, even if you do have a
> domain name tied to your IP with MX records and all that.
>
> Most likely, however, is that Bigpong have blocked all of iiNet's IP
> addresses except for their mail servers.
>
> A simple work around is to relay all mail via your ISP, frex my main.cf
> has "relayhost = [mail.tpg.com.au]" and everything gets through fine, now.

Yep. That seems to do it. The mail.log says delivered DSN, not
4.4.2 any more. I'll wait to hear from them to confirm they got
my test email, but looks like it will go through.

Thanks mate.

--
Troy Piggins

* Martin Gregorie wrote :
> On Tue, 28 Apr 2009 21:42:28 +1000, Troy Piggins wrote:
>
> [---=| Quote block shrinked by t-prot: 10 lines snipped |=---]
>>
>> Not just a particular address. Every time I send mail to anyone at
>> bigpond.net.au - my parents, my aunty, and several friends. Bigpond is
>> probably the largest ISP in Australia.
>>
> OK
>
>> No. My server keeps trying, then eventually I'll get a failed notice.
>>
> OK
>
>> I haven't configured it, so it's just the default I guess. Ubuntu
>> distro. Is smtp_connect_timeout the relevant one? Default is 30s.
> OK
>
> I was wondering if Bigpond had turned on greylisting. My ISP did a couple
> of months back. Mail does get delayed by it between a few minutes and a
> hour or so but it works - pre-greylist 70% of my incoming mail was spam.
> Now only 7% is.
>
> I agree with Gary - since most spambots send direct from the infected PC
> its very common for all an ISP's IP range to be blacklisted apart from
> its mail servers. Like him, my Postfix MTA has always been configured to
> send through my ISP's mailserver with a 'relayhost' directive.

Thanks mate. Replied to Gary's post. That seems to have done
it.

--
Troy Piggins