Englishstefan21 it might be impossible to setup a mailserver without having a static IP4.
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.
I´m sending mail from a dynamic IP, no mail´s get rejected so it´s possible.
Before that i used smtp2go, also work´s great.
storpotaten no mail´s get rejected so it´s possible.
With a relay service yes. Otherwise you are very very lucky.
Maybe, my IP resolves to “94-255-167-***.cust.bredband2.com” the host of my ISP,
i could be wrong but if everhing else in in place DKIM, SPF and so on the sending of emails seems to work.
i´m far from an emailserver expert but this is my experience.
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:
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
I don’t have a customized FritzBox. It’s an original. Therefore I can’t help. You should ask Vodafone.
Vodafone is my provider. At home I don’t have a static IP. Therefore I use an unbranded (no customized firmware) fritzbox.
And this: Fritz!Box JSTool
mengelke.de
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.
