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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Just take a look at https://docs.mailcow.email/
This runs from a small box with everything included. It gives you all the tools and config needed for running a secure and feature rich email service. Webmail, some sort of exchange emulation, webcalender on top of a solid postfix/dovecot install with rspamd as spam filter. Everything is configurable via a nice web UI.
After 15y running my own mail service and editing a lot of config files, I use this piece of free and open software and find it very good. All you need is a box somewhere in the internet. Running from a homelab will instantly fail, expect you have a static ip.
Been using mailcow too. Pretty solid setup. Gmail doesn't play nice with spam though even though SPF, dkim, and dmarc are properly setup. I ended up having to relay through sendgrid to ensure emails for delivered.
Still don't regret it though.
Maybe google blocks large IP-blocks of vps-hosters like digital-ocean then? I moved My mail-setup from a 15y old ip with best reputation to a new one on the vps-hoster that is listed as provider on the mailcow-site. I have no problems at all, I have DMARC reports enabled and all mails to gmail are passing.
The only provider that was blocking the ip was german telekom, t-online. I wrote a mail to the abuse/postmaster and with some asking for imprint on the webpage that the ip was pointing at, they whitelisted the ip in 24h.
mailcow has some sort of dns-settings agent that shows the dns-settings for every domain, rDNS and DKIM, DMARC, SPF and check these settings with the values reported by the DNS.
I'm with ovh dedicated. I just gave up on trying to fix the issue.
I don't remember mailcow having a list of recommended hosters. I'll go check that out!