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Email 2 (Beta)

The Email 2 module is an alternative to email-section, based on the Rspamd filter engine. It aims to be the successor of the current Email module, by providing the same features plus new ones. For background information refer to email-section page.

Once installed from the Software center page, go to the Email page as usual.

Features planned for final release

  • Backward-compatible disclaimer signature (on development)
  • Integrate Rspamd UI in Server Manager (waiting for an upstream fix)

Configuration options

New configuration options, specific to Email 2, are

  • DKIM signature
  • Rspamd web UI
  • Delay for suspicious threshold (greylisting)

DKIM signature

DomainKeys Identified Mail (DKIM) provides a way to validate the sending MTA, which adds a cryptographic signature to the outbound message MIME headers.

To enable the DKIM signature for a mail domain, enable Email > Domains > Sign outbound messages with DomainKeys Identified Mail (DKIM).

To work effectively, the public DNS must be configured properly. Follow the instructions provided by the configuration page itself.

Rspamd web UI

The Rspamd web UI is available on a randomized URL via the administrative HTTPS port 980 (like Server Manager). For security reasons the connection is restricted to trusted networks only.

The random URL and the password required to access Rspamd web UI are available under Email > Filter > Rspamd user interface.

The URL is also available listed under the Applications page.

Delay for suspicious threshold

A new spam score threshold is provided by Rspamd. If the spam score is above it, the message is temporarily rejected. An SMTP-compliant MTA must attempt to deliver the deferred message again; spammers are likely to give up instead.

To adjust the threshold see Email > Filter > Anti spam > Delay for suspicious threshold.

Upgrade procedures

It is possible to switch a running system to this new module, starting from the Email module, or a SMTP proxy module installation.

From Email module

To switch an old mail server with amavisd-new filter engine to rspamd run the following command: :

yum swap \
    -- remove nethserver-mail-{common,filter,server} \
    -- install nethserver-mail2-{common,filter,server}

If something is wrong with rspamd, please report the issue on community.nethserver.org. To switch back to the old engine: :

yum swap \
    -- install nethserver-mail-{common,filter,server} \
    -- remove nethserver-mail2-{common,filter,server}

From SMTP proxy module

To switch an old SMTP proxy based on amavisd-new filter engine to rspamd run the following command: :

yum swap \
    -- remove nethserver-mail-{common,filter} \
    -- install nethserver-mail2-{common,filter}

If something is wrong with rspamd, please report the issue on community.nethserver.org. To switch back to the old engine: :

yum swap \
    -- install nethserver-mail-{common,filter} \
    -- remove nethserver-mail2-{common,filter}