Can i use mailcow on a dynamic IP with DDNS-updater for my usecase? (lemmy.world)

submitted 11 months ago by kylian0087@lemmy.world to c/selfhosted@lemmy.world

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Hello everyone,

I am currently running a server with the Pterodactyl panel for various game servers, and it has been working great for several years. However, I would like to set up a system for Pterodactyl to send out password reset emails when necessary. I am considering using Mailcow on the same host specifically for this purpose. Currently, I am using an application named DDNS-Updater to automatically update all records on Cloudflare when my IP changes. While my IP doesn't change often, it can happen; it occurred once this year. Would this pose an issue for a mail server? If the emails end up in the spam folder, it is not a major concern since they are only password reset emails. However, it is crucial that the emails reach the intended recipients.

Thank you.

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[-] nitrolife@rekabu.ru 1 points 11 months ago

You need to create an MX record in the DNS zone of your domain. Something like:

@ IN MX 10 my.zome.
@ IN MX 20 server1.my.zome.

You can create 1 MX record or more. 10 and 20 server priority for input mails.

Then you need to create an spf record. There are several options here. For example

@ IN TXT "v=spf1 +a +mx -all"

allows you to send emails from A domain records, then from MX domain records and prohibits from all other hosts.

Theoretically, you can only create an SPF record with A but without MX and dont create MX DNS records. Although I have not tried this configuration.

This is the minimum set after which you will get into spam, but at least the letters will reach.

You also need to make a PTR record to avoid spam folder, but this is not possible on a dynamic IP.

[-] taladar@sh.itjust.works 1 points 11 months ago

If A and MX point to the same server you do not need the MX record.

Quite a few mail providers will also just blacklist all dynamic IPs in general.

I would recommend sending the mails via a smarthost (i.e. some authenticated SMTP connection).

this post was submitted on 13 Dec 2023

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