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Self-hosted blog - do I need a static IP address? (lemmy.ml)
submitted 1 year ago by to c/selfhosted@lemmy.world
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hi everyone,

I was just about to self-host a Ghost blog but then was warned that my ISP might change my external IP address at any time, so I would need to pay for a static IP address.

Is that true?

(I'd not seen much about that in stuff I've looked up so far about self hosting)

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[–] 1 point 1 year ago* (last edited 1 year ago) (3 children)

Your page is explicitly a support page for dkim config. It is not a list of email requirements. YOU don't control their ptr records. Ptr records are placed on the IP space side. Google controls theirs for workspaces. So that page won't have help on the matter. Requirements haven't changed. I control systems that send millions of messages a month...

Ptr, SPF and dkim are now mandated. Dmarc is highly recommended for gmail...

Edit: https://forum.directadmin.com/threads/gmail-rejecting-emails-due-to-missing-or-incorrect-ptr-record-%E2%80%93-how-to-set-this-up-correctly.72802/
https://www.reddit.com/r/webdev/comments/1foik1l/false_error_message_does_not_have_a_ptr_record/
https://dmarcreport.com/blog/googles-guidelines-to-send-emails-to-gmail-users/

How many links you need before you recognize that you're wrong? All three of these are from last 10 months. One of which was from March.

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  • [–] 1 point 1 year ago (2 children)

    I don't know what to tell you. I'm literally looking at my DNS records at cloudflare that point to my home IP and there is no PTR entry and yet I have dozens of emails in my gmail account about scheduled process and Prometheus alerts etc. The last undeliveryable I got from Gmail was 2 month ago when I was setting up the email server. Maybe because I'm on Google Fiber it's not enforcing it but I have no PTR record.

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  • [–] 1 point 1 year ago* (last edited 1 year ago) (1 child)

    I’m literally looking at my DNS records at cloudflare

    PTR records are NOT on the domain side.

    https://www.cloudflare.com/learning/dns/dns-records/dns-ptr-record/

    An example record lookup would be 8.8.8.8.in-addr.arpa. Like I've said twice now. YOU don't control google's PTRs (since you linked to google workspaces). They DO have PTRs setups.

    IP of 142.251.2.109 resolved for my DNS.

    https://easydmarc.com/tools/ptr-record-lookup?domain=142.251.2.109&dns_server=1.1.1.1&dns_type=PTR

    Resolves to a record name of dl-in-f109.1e100.net

    Edit: Another name for a PTR record is rDNS. Or Reverse DNS. and that name is a bit more descriptive in that it's IP -> Name rather than DNSes normal job of Name -> IP address

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  • [–] 1 point 1 year ago

    I don't use Google Workspaces that's just the first article I found.

    Maybe I misunderstood then. I though PTR records had to resolve to your email domain, not just match the IP address with an A record that resolves to the same IP. There is a PTR record that resolves to ip.googlefiber.net but it does not match my email domain.

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