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this post was submitted on 12 Jun 2023
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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!