Posteo.de Features OpenPGP / WKD: Yes. Posteo natively supports OpenPGP in its webmail interface (fully integrated with Mailvelope) and supports OpenPGP headers. IMAP / SMTP: Yes. Unlike Tuta or Proton Mail (which restrict native IMAP/SMTP due to their architecture), Posteo fully supports standard IMAP and SMTP protocols out of the box, allowing you to use any third-party local email client. Encrypted Storage: Yes. Posteo provides an optional, server-side data encryption feature (“crypto mail...

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