timelimit-server/docs/concept/mail-blackwhitelist.md

Mail (server) black- and whitelist

mail server blacklist

Problem

• some mail servers don't accept mails due to their spam filter
• users blame timelimit for it although their bad mail service is the problem

Solution

• (external) monitoring
• the blacklist

Description

The mail server blacklist is a list of servers to which no sign up mails are sent. But instead of doing nothing, the client is informed about that so that it can tell the user that this mail service is not supported and that he should use a mail address at an other mail service.

mail (server) whitelist

Problem

• some users do run private server instances
• they do not want that someone else can use their instance

Solution

• the whitelist

Description

The whitelist contains mail servers and/ or mail addresses which should be allowed. Users of mail addresses which are not in the whitelist are informed about that so that they know that it is a private instance and that they can not use it.