Alternatives to Poste.io

All-in-one Docker mail server with web admin and built-in TLS. The listings below can replace it for an important use case. Each note says what changes if you switch.

Replacements

Listings that take over the same core job as Poste.io.

  • Mailcow

    Dockerized open-source mail server suite with web admin and webmail.

    FreeOpen sourceLinuxSelf-hosted

    Mailcow is a fully open-source Docker suite with a web admin panel and SOGo webmail, with no paid licensing, but higher resource needs.

  • Mail-in-a-Box

    Turnkey open-source script that builds a full mail server on Ubuntu.

    FreeOpen sourceLinuxSelf-hosted

    Mail-in-a-Box is a free open-source turnkey script that builds the mail stack on Ubuntu without Docker, tied specifically to Ubuntu.

  • iRedMail

    Free open-source mail server installer for Linux and BSD.

    FreeOpen sourceLinuxSelf-hosted

    iRedMail is a free open-source installer that sets up a full mail stack on many Linux and BSD distributions through a text-based script.

  • Modoboa

    Open-source mail hosting platform with an admin UI and webmail.

    FreeOpen sourceLinuxSelf-hosted

    Modoboa is a free open-source mail hosting platform with an admin UI and webmail, installed on a Linux server, with a smaller community.

  • Stalwart

    Rust-based all-in-one mail server supporting JMAP, IMAP, and SMTP.

    FreeOpen sourceLinuxSelf-hosted

    Stalwart is a free open-source Rust mail server with JMAP support beside IMAP and SMTP, from a newer project with a smaller ecosystem.

  • Maddy

    Composable single-binary open-source mail server written in Go.

    FreeOpen sourceLinuxSelf-hosted

    Maddy is a free open-source single Go binary with composable configuration, without the bundled web admin and webmail Poste.io includes.

Similar software

Related functionality, not a direct replacement.