https://posteo.de/en/blog/new-webmail-interface-displays-servers-with-the-highest-sending-security
We have just released a new feature for you: Our webmail interface now
shows you which of your contacts you can send to with the optimal
security of DANE technology. This can be recognised by a small, green
DANE symbol above an email address.
For us, the new DANE display is something very special. When we
introduced this new piece of security technology in May 2014, Posteo was
according to heise.de the first provider worldwide to support DANE. Many
IT experts were unsure at that time whether the new technology would
become established. In the meantime, this has changed – it is now
worthwhile displaying whether another server supports DANE: We now
transfer emails to many email servers worldwide using DANE as standard,
including large email providers such as 1&1 (as well as mail.com, GMX
and web.de) and Comcast.
[...]
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