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esackbauer That is true. It is working for receiving mails, but no chance to send mails via a dynamic IP.
Pay for a relay service then (they can read your mails…), or get a business cable product with static IP and the possibility to have a reverse DNS entry, or pay for a decent hoster.

In business we have only static IP’s. Not for private. Question is, could a dynamic IP have an impact on DKIM? Hmm…?

Anyone out there running mailcow on top of any linux OS with a dynamic IP?

    storpotaten
    Some servers might still decline your mail because it’s on a DNSBL for dial up/dynamic IPs.
    I know because I am in the same situation 🙂
    This is why I use a relay.

      storpotaten I´m sending mail from a dynamic IP, no mail´s get rejected so it´s possible.

      Thank’s for jumping on.

      AFAIK any email sent from a dynamic IP would be rejected from my customers and suppliers. In business a dynamic IP is no option. It’ll simply won’t work.

      [unknown]

      If you’re using a relay, this is not what I’m looking for. We don’t send email through a relay. We are running our email servers totally on our own. No relay, no smarthost, no connector, … I mean, what for? We are talking about an email server. No need for anything around. That’s it.

          stefan21 If you’re using a relay, this is not what I’m looking for. We don’t send email through a relay. We are running our email servers totally on our own. No relay, no smarthost, no connector, … I mean, what for? We are talking about an email server. No need for anything around. That’s it.

          Sure, it’s “just” an email server, but most of the mails sent by it will be rejected nonetheless due to you dynamic IP, wether it’s private or for business purposes. Looking up the IP blacklist is a default option not only for mailcow.
          And it’s a real pain if you never can be sure if your mail has been delivered or just silently dropped by the SPAM filter…
          Just saying 😃

            Maybe I didn’t make it clear enough: in business we do only use static IP’s and email-servers without relay, smarthost, … All business domains have 10/10 at mail-tester. No issues at all, no matter where or what I test against.

            Not so for private. As I said, the vodafone IP is so-called pool-IP, not static.

            Follow up while digging around:

            1. I had to change my fritzbox 6490 cable in bridge mode. Exposed host for the asus router behind was not enough.
            2. Now the asus shows a WAN IP, which in (real) bridge mode of the fritzbox is a different one as shown in the fritzbox. The WAN IP shown in the asus is to be set in the DNS settings at the hoster.
            3. The laptop is configured as DMZ in the asus.
            4. On the laptop I installed nginx as reversed proxy. I took the example config from mailcow and changed it to my domain.
            5. I started over with a new mailcow-docker installation.
            6. Unbound container was unhealthy. As the asus is running with unbound, I tried to point the forward zone in unbound.conf to the IP of the asus. That didn’t work. Unbound container showed healthy, but error during the acme challenge occurred. I changed the IP to 1.1.1.1. That worked. The challenge completed.
            7. I created a domain and a test user.
            8. I took the dkim key to the DNS (as well as the other settings to make).
            9. I tested from sogo an email to email-tester composed in html. So far o.k., dkim passes, not a 10/10 because auf rDNS setting. This was to expect.
            10. Changed sogo to plain text, email test also o.k.
            11. Tried thunderbird - email tests also o.k.
            12. Did a backup.

            Well - it is was not so easy to track this down. Still some questions open. But maybe it helps someone. I’ll keep this running and testing at home for a while. If the mailcow runs smooth, I’ll migrate my email servers in business. And will donate for this great work.

            regards,
            stefan

              10 months later

              stefan21

              Hey,

              also have the same Fritz!Box (Vodafone) here, but couldn’t get the bridge-mode working.
              Maybe you got a tip?

              Thanks.

                I don’t have a customized FritzBox. It’s an original. Therefore I can’t help. You should ask Vodafone.

                  6 days later

                  Vodafone is my provider. At home I don’t have a static IP. Therefore I use an unbranded (no customized firmware) fritzbox.

                  Read this: ubiquiti - Deutsches Fan Forum Icon Fritz!Box | Cable (6490, 6590, 6591, 6660) Bridge-Mode freischalten - ubiquiti - Deutsches Fan Forum

                  ubiquiti - Deutsches Fan Forum Icon ubiquiti - Deutsches Fan Forum
                  Fritz!Box | Cable (6490, 6590, 6591, 6660) Bridge-Mode freischalten - ubiquiti - Deutsches Fan Forum

                  And this: mengelke.de Icon Fritz!Box JSTool

                  mengelke.de Icon mengelke.de
                  Fritz!Box JSTool
                  Checksum mit JavaScript berechnen, Konfig-Datei entschl
                  MEngelke.demengelke.dezu HTTPS wechseln

                  This adds the option “bridged mode” to an unbranded fritzbox.

                  In business we use Vodafone only with static IP’s. This allows to run their customized fritzbox firmware in bridged mode.

                  If all pre-requisites are fulfilled (read mailcow docs) the mailserver works flawless.

                  @sOliver

                  Even with this hack you’ll have an IP from their pool. It’s not a dedicated static IP which only belongs to you. You’ll definitely have problems sending emails. Check the blacklists… A mailserver without a static dedicated IP is not recommended.

                    a month later
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