Spam detection in Tutanota is multi staged. For incoming unencrypted SMTP emails the received email is checked against DNS blacklists first. In a second stage we filter emails by executing content checks and mark emails as spam or not. Emails that have been marked as spam will be moved to the spam folder of your mailbox. In a third stage we filter spam on the base of user defined email sender lists. This list provides the possibility to classify email addresses as spam (blacklist) or explicit not as spam (whitelist). The check is active for all incoming emails and can be configured by the administrator. The rules are valid for all user accounts.
As administrator for a Tutanota account you can configure the email address list in "Settings" -> "Spam rules" (new client: "Settings" -> "Global Settings" -> "Spam Rules"). You assign email addresses or domains to one of the following spam rules:
The "No spam" rule has a higher priority than "Always spam" and "Discard" has the lowest priority. Furthermore you are able to define rules based on a domain instead of a single email address. Rules defined for a domain have a lower priority than rules for an email address.
- No spam - Emails from this sender email address are always stored in the inbox.
- Always spam - Emails from this sender email address will always stored in the spam folder.
- Discard - Emails from this sender email address will be silently discarded. The sender does not get any information about it.
Rules for domains are restricted. You are not able to assign the rules "Always spam" and "Discard" to Tutanota domains, neither your custom domains.