# Is it possible to communicate with non-DC user? (interoperability with email) **URL:** \ **Category:** Mutual Help\ **Tags:** open-standards, chatmail\ **Created:** [December 8, 2025, 8:54am UTC](https://forum.delta.chat/t/is-it-possible-to-communicate-with-non-dc-user-interoperability-with-email/4425 "2025-12-08T08:54:55Z")\ **Posts on this page:** 1\ **Showing post:** 7
**Author:** ![Minim](https://forum.delta.chat/letter_avatar_proxy/v4/letter/m/ccd318/32.png) [@Minim](https://forum.delta.chat/u/Minim)\ **Post date:** [December 12, 2025, 11:20pm UTC](https://forum.delta.chat/t/is-it-possible-to-communicate-with-non-dc-user-interoperability-with-email/4425/7 "2025-12-12T23:20:14Z")
> [@belkka](#): > > I assume it must be possible and reasonable to perform key verification **shortly after** keys were distributed over insecure channel, but not sure **how** In the chat: hamburgermenu\>“Encryption info” This displays the fingerprints. Is K9 not capable of sending an e-mail with Autocrypt headers in step 1? A caution; DC does not yet have key rotation. It will reject messages with an Autocrypt header that does not match what it expects, so the trust-on-every-use situation is absent. Alternately, if your keys are published (most keyring programs and some mailclients let you publish them) you can get them from a WKD bot: > [@The life-changing magic of WKD](https://support.delta.chat/t/the-life-changing-magic-of-wkd/2258/36): > > There is a webxdc app that does it: [webxdc apps](https://webxdc.org/apps/#r10s-asc-to-vcard) ([r10s/asc-to-vcard: Create VCards from classic PGP .asc public key files. - Codeberg.org](https://codeberg.org/r10s/asc-to-vcard)) It was mentioned above: There is also a bot that looks up keys on keyserver and WKDs by email address and sends back vCards: --- _[View the full topic](https://forum.delta.chat/t/is-it-possible-to-communicate-with-non-dc-user-interoperability-with-email/4425)._