Posteo (email provider)

[aoi]

What is your opinion about posteo.de?
Email green, secure, simple and ad-free - posteo.de -
I think it should be added under the email section.

[jonah]

Best secure email service?

I think mailbox.org is the better choice because they actually have a DMARC policy. With posteo, anyone can spoof posteo domain and the remote mail server has no way of checking that. It’s a nice option to have, which is not possible with Posteo. They claim the reason is “for privacy”: Can I use Posteo with my own domains? No. We are an email provider with a particular, privacy-oriented model – and this is not compatible with incorporating own domains. One of our emphases is data economy…

[aoi]

E-Mail grün, sicher, einfach und werbefrei - posteo.de - Postmaster

“Posteo domain names used in the From header, in the envelope from/Return-Path header and for the signing DKIM domain (if DKIM-signed) are in strict aligment with each other. However, we have a DMARC “none” policy for Posteo email domain names, since DMARC is currently not recommended for mailbox providers. Outbound DMARC policies are primarily “best-suited for transactional emails and semi-transactional emails” (
dmarc.org
FAQ). At the present, DMARC has implications which do not meet customers’ individual use of email.”

Posteo is using DKIM not DMARC.