[Semibug] DDNS & PTR

Joe Price jprice at spacewalk.net
Sat Apr 20 19:38:35 EDT 2019


I was gonna suggest a smarthopst. depending on how much stuff you are 
sending and maybe whether or not you are a commercial account you may be 
able to send through your ISPs mail server. I know I used to be able to 
do this on Comcast.

You could also get a VPS and then VPN to it and send whatever you want.

On 4/20/2019 8:51 AM, Carl T. Miller wrote:
> And, if your ISP balks at giving you a PTR record, ask them
> for an email relay server aka smarthost and set your mail
> server to relay through it.
>
> c
>
>
> On 4/19/19 9:48 PM, Michael W. Lucas wrote:
>> Your current IP has no PTR at all. (That's what the NXDOMAIN below
>> means.)  Contact your ISP to have them set one.
>>
>> $ dig -x 147.92.105.244
>>
>> ; <<>> DiG 9.12.4 <<>> -x 147.92.105.244
>> ;; global options: +cmd
>> ;; Got answer:
>> ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 15109
>> ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1
>>
>> ;; OPT PSEUDOSECTION:
>> ; EDNS: version: 0, flags:; udp: 4096
>> ; COOKIE: 339b3c3612bc4e03c73a922f5cba7a1f2a143b9b08e9569a (good)
>> ;; QUESTION SECTION:
>> ;244.105.92.147.in-addr.arpa.   IN      PTR
>>
>>
>>
>>
>> On Fri, Apr 19, 2019 at 08:57:09PM -0400, Mark Moellering wrote:
>>> I don't have comcast service.?? I have golightspeed, which was just
>>> acquired by MetroNet.?? I have fiber to the home and port 25 is open 
>>> :-)
>>>
>>> but I can't email anyone with a comcast address.?? Their mail server 
>>> very
>>> helpful says:
>>>
>>> host mx1.comcast.net[96.114.157.80] refused to talk to me: 554
>>> resimta-po-34v.sys.comcast.net resimta-po-34v.sys.comcast.net
>>> 147.92.105.244 Comcast requires that all mail servers must have a PTR
>>> record with a valid Reverse DNS entry. Currently your mail server does
>>> not fill that requirement. For more information, refer to:
>>> http://postmaster.comcast.net/smtp-error-codes.php#554
>>>
>>> There are other networks with similar messages.?? Right now, I have my
>>> domain through Godaddy.?? I will have to see if they offer DDNS
>>>
>>>
>>> Thanks for the reply
>>>
>>>
>>> -- Mark
>>>
>>>
>>> On 4/19/19 6:47 PM, Anthony Cascianelli wrote:
>>>> Comcast will sell you a static IP address. But you might be 
>>>> surprised at how seldom your Comcast IP changes. I???ve been in my 
>>>> current house for over 2 years and I???m pretty sure it???s never 
>>>> changed.
>>>>
>>>> How are you running a mail server on residential Comcast service?  
>>>> I thought they specifically blocked inbound on those ports.
>>>>
>>>> Whose late you hosting your domain name through?  I use Namecheap 
>>>> and they offers a DDNS update service.
>>>>
>>>> Anthony Cascianelli
>>>>
>>>>> On Apr 19, 2019, at 8:29 PM, Mark Moellering 
>>>>> <markmoellering at psyberation.com> wrote:
>>>>>
>>>>> How hard is it to get a PTR record for a dynamic (home) IP?  I am 
>>>>> running my own email server and Comcast demands a PTR
>>>>>
>>>>>
>>>>> I think you can do it with DDNS but I am not sure of the best 
>>>>> place to set that up.  Any pointers?  Is there any way to buy IP 
>>>>> addresses and just have them forward to my home IP. or is that 
>>>>> laughably difficult?
>>>>>
>>>>> Thanks, and I hope this makes it to the list
>>>>>
>>>>>
>>>>> -- Mark
>>>>>
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>>>>> Semibug at lists.nycbug.org
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