Cannot resolve PTR record stopping relay?

My wife has a Nokia 9300 phone that I'm trying to set up the email for.
My sendmail is rejecting her relay with a "Relaying temporarily
denied. Cannot resolve PTR record for 166.129.241.44". I know why you
wouldn't normally want to relay from an address that can't be resolved
but if the connection is authenticated I don't think it is a too serious
a risk. Is there any way to disable this feature?

Thanks,

--

Knute Johnson
email s/nospam/knute/

Re: Cannot resolve PTR record stopping relay?

In article Knute Johnson
writes:
>My wife has a Nokia 9300 phone that I'm trying to set up the email for.
> My sendmail is rejecting her relay with a "Relaying temporarily
>denied. Cannot resolve PTR record for 166.129.241.44". I know why you
>wouldn't normally want to relay from an address that can't be resolved
>but if the connection is authenticated I don't think it is a too serious
>a risk. Is there any way to disable this feature?

There's nothing to disable, sendmail doesn't deny relaying due to
failure to resolve the PTR - it's just trying to tell you "You may be
allowed to relay based on the hostname that I couldn't find, but there
is nothing else that would allow the relay, so I have to deny it for
now". I.e., apparently there was no successful authentication, since
relay is always allowed for authenticated connections.

--Per Hedeland
per@hedeland.org

Re: Cannot resolve PTR record stopping relay?

Per Hedeland wrote:
> In article Knute Johnson
> writes:
>> My wife has a Nokia 9300 phone that I'm trying to set up the email for.
>> My sendmail is rejecting her relay with a "Relaying temporarily
>> denied. Cannot resolve PTR record for 166.129.241.44". I know why you
>> wouldn't normally want to relay from an address that can't be resolved
>> but if the connection is authenticated I don't think it is a too serious
>> a risk. Is there any way to disable this feature?
>
> There's nothing to disable, sendmail doesn't deny relaying due to
> failure to resolve the PTR - it's just trying to tell you "You may be
> allowed to relay based on the hostname that I couldn't find, but there
> is nothing else that would allow the relay, so I have to deny it for
> now". I.e., apparently there was no successful authentication, since
> relay is always allowed for authenticated connections.
>
> --Per Hedeland
> per@hedeland.org

Thanks very much Per. I increased the log level and then I saw the
authentication failure. The PTR appears not to be relevant.

So that brings me to the problem of why I can't authenticate. This
sendmail configuration does work on my desktop but not with the phone.
I am using STARTTLS and PLAIN authentication. The phone appears to act
normally and sends the password but it fails. I have entered the
password into the phone at least 10 times and it has failed every time.

Any ideas on how to diagnose my problem? The password that is displayed
in the sendmail log is encrypted or scrambled. Is there a way to see
the clear text password in the log?

Thanks very much,

--

Knute Johnson
email s/nospam/knute/

Re: Cannot resolve PTR record stopping relay?

Knute Johnson wrote:
> Per Hedeland wrote:
>> In article Knute Johnson
>> writes:
>>> My wife has a Nokia 9300 phone that I'm trying to set up the email
>>> for. My sendmail is rejecting her relay with a "Relaying temporarily
>>> denied. Cannot resolve PTR record for 166.129.241.44". I know why
>>> you wouldn't normally want to relay from an address that can't be
>>> resolved but if the connection is authenticated I don't think it is a
>>> too serious a risk. Is there any way to disable this feature?
>>
>> There's nothing to disable, sendmail doesn't deny relaying due to
>> failure to resolve the PTR - it's just trying to tell you "You may be
>> allowed to relay based on the hostname that I couldn't find, but there
>> is nothing else that would allow the relay, so I have to deny it for
>> now". I.e., apparently there was no successful authentication, since
>> relay is always allowed for authenticated connections.
>>
>> --Per Hedeland
>> per@hedeland.org
>
> Thanks very much Per. I increased the log level and then I saw the
> authentication failure. The PTR appears not to be relevant.
>
> So that brings me to the problem of why I can't authenticate. This
> sendmail configuration does work on my desktop but not with the phone. I
> am using STARTTLS and PLAIN authentication. The phone appears to act
> normally and sends the password but it fails. I have entered the
> password into the phone at least 10 times and it has failed every time.
>
> Any ideas on how to diagnose my problem? The password that is displayed
> in the sendmail log is encrypted or scrambled. Is there a way to see
> the clear text password in the log?
>
> Thanks very much,
>

Do you have tcpwrappers set up in sendmail and if so is it blocking the IP of the phone?

dp

Re: Cannot resolve PTR record stopping relay?

dp wrote:
> Knute Johnson wrote:
>> Per Hedeland wrote:
>>> In article Knute Johnson
>>> writes:
>>>> My wife has a Nokia 9300 phone that I'm trying to set up the email
>>>> for. My sendmail is rejecting her relay with a "Relaying
>>>> temporarily denied. Cannot resolve PTR record for 166.129.241.44".
>>>> I know why you wouldn't normally want to relay from an address that
>>>> can't be resolved but if the connection is authenticated I don't
>>>> think it is a too serious a risk. Is there any way to disable this
>>>> feature?
>>>
>>> There's nothing to disable, sendmail doesn't deny relaying due to
>>> failure to resolve the PTR - it's just trying to tell you "You may be
>>> allowed to relay based on the hostname that I couldn't find, but there
>>> is nothing else that would allow the relay, so I have to deny it for
>>> now". I.e., apparently there was no successful authentication, since
>>> relay is always allowed for authenticated connections.
>>>
>>> --Per Hedeland
>>> per@hedeland.org
>>
>> Thanks very much Per. I increased the log level and then I saw the
>> authentication failure. The PTR appears not to be relevant.
>>
>> So that brings me to the problem of why I can't authenticate. This
>> sendmail configuration does work on my desktop but not with the phone.
>> I am using STARTTLS and PLAIN authentication. The phone appears to
>> act normally and sends the password but it fails. I have entered the
>> password into the phone at least 10 times and it has failed every time.
>>
>> Any ideas on how to diagnose my problem? The password that is
>> displayed in the sendmail log is encrypted or scrambled. Is there a
>> way to see the clear text password in the log?
>>
>> Thanks very much,
>>
>
> Do you have tcpwrappers set up in sendmail and if so is it blocking the
> IP of the phone?
>
> dp

Tuns out the phone is actually logging in with CRAM-MD5 no matter what
is presented as allowable. That took me a while :-).

So I was completely clueless. Thanks for you interest though.

--

Knute Johnson
email s/nospam/knute/