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I've been with them for a couple years. Also very happy with the service. Quite cheap.

I use it with my own domain and its been stellar.

Do you use a mail forwarding service along with Posteo, since it doesn’t support custom domains on the service?

Yes, in a way. My DNS provider, LuaDNS, has a pseudo-record of type FORWARD [0] which sets up both the MX records and the forwarding.

Other than that, I set up SPF and DMARC.