On Tue, Nov 2, 2021, 21:28 Michael Barnes <[email protected]> wrote:
> On Tue, Nov 2, 2021 at 6:16 PM wes <[email protected]> wrote: > > > On Tue, Nov 2, 2021 at 6:05 PM Michael Barnes <[email protected]> > > wrote: > > > > > What an ordeal. I have a security camera system that sends email > alerts. > > I > > > used to send via Google, but they tightened up their security and I > > cannot > > > use that any more. I figured I'd just set up a simple mail server on an > > RPi > > > and do it myself. My ISP provides a static IP I can set up pretty much > > > anything I want. I bought a domain name through hover.com for the > > purpose, > > > and set up A and MX records in their DNS. > > > > > > I finally got my mail server figured out and working and try to send > > email > > > to my normal account, which is promptly rejected by my email provider > > > (IONOS) for a bad PTR record. (Mail does go to my gmail account without > > > complaint.) I go into the dashboard for my domain to set the PTR > record, > > > and there is no option. I contacted tech support and get "Sorry, we do > > not > > > support PTR records. You will need to host your DNS with a 3rd party." > > What > > > he heck kind of domain registrar who provides DNS services does not > > support > > > PTR records? > > > > > > > the first half of their answer is sensible, the second half is not. no > DNS > > provider can do what you're looking to do. > > > > > > > > > > Been browsing the Internet for DNS providers, and can't find anything > > that > > > tells me what they support. The few who I contacted said basically, > "Sign > > > up for our service to see what records we support." Seriously? > > > > > > > yeah, that's ridiculous. > > > > > > > It's been like 15 years or more since I did this kind of stuff. Got to > > > learn it all over again. > > > > > > > I would suggest that you begin by learning more about what a PTR record > is > > and how it's used. it is essentially a DNS record for an IP address - the > > opposite of what we typically understand as a DNS record. this is often > > referred to in shorthand as a "reverse DNS record." > > > > > > > > > > Anybody have suggestions on a free or cheap DNS provider that I can set > > PTR > > > and any other needed records? > > > > > > > since a PTR record is set on the IP address, only the owner of the IP > > address can set it. you will need to ask your ISP if they allow this. > most > > business-class providers allow it, most residential-class don't, and > > everywhere in between will give different answers. > > > > alternatively, you can configure your mail server to announce itself as > the > > hostname that matches what's currently in your PTR record, if it exists. > > this is not super trivial, it will involve a fair amount of work, but it > > can be done. > > > > -wes > > > > Like I said, it has been many years since I've worked at this level and I > have probably forgotten more than I knew in the first place. > > Thanks for your comments. After a little research, I think I understand the > issue better. I do have a static IP through my ISP and they said my running > servers should not be an issue, so I hope this is something they will > accomodate. > > Thanks, > Michael > . Wes is correct + it makes sense - IP owner is the entity which can create reverse DNS record for the IP. If you want to do your own email server, on Linode for example, you will go to your DNS provider and set Linode's DNS server as your domain DNS or just email DNS. Then create your zone + reverse record on Linode's DNS server. This might seem like unnecessary hassle, to have essentially two separate DNS providers. In my experience, if you care about controlling your domain long term, it is very good idea to separate DNS and ISPs providers. That way, you can move ISPs as well as DNS services independently. Best luck, T
