Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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Some strict mail servers even blacklist you if the DMARC record is missing.
Some servers blacklist you even if you have DMARC, SPF, DKIM, DNS setup perfectly, but your IP is in a block of addresses that may or may not have been hosted by the same ISP of some unrelated server that was possibly compromised 10 years before you even set up the mail server. Ask me how I know.
Some servers blacklist you no matter what you do because you’re not a big player in the e-mail space… Outlook. Fuck Outlook. M365 doesn’t do that though.
Also the idea that reverse IPs are needed (in practice) when SPF, DKIM and DMARC are in use is insane. I have literally told you my public key and signed the e-mail. It’s me. You don’t need to check the damn PTR!