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Users and permissions / Blacklist

Blacklist#

A list of values the system refuses. It exists for repeat spammers and for people who create a new account after theirs is blocked.

Blacklist

Find it under Základy → Uživatelé → Blacklist.

What can be blocked#

Type Blocks
E-mail one address — both registration and form submission
Phone one number — registration with that phone
IP address one connection

The list has three columns: ID, Typ (type) and Hodnota (value).

Adding an entry#

  1. přidat above the list.
  2. Choose the type — email or IP address.
  3. Fill in the value.
  4. Save.

It takes effect immediately.

Blocking an IP address#

An IP address points at a connection, not a person

Most households and companies share one public IP across all their devices, and providers hand them out temporarily. Blocking an IP can therefore cut off people who have nothing to do with the problem, and miss the one you meant to block — they need only reconnect.

Use IP blocks briefly against an attack in progress. For an individual, use the email or block the account.

The system accepts IPv4 (88.101.23.7) and IPv6 (2a00:1028:9194:5d3e:…). One visitor may have both — blocking one version lets them in through the other.

Blocking an email#

More reliable than an IP, but sidestepped by creating a new address. It makes sense against a specific recurring sender, not as blanket protection.

A domain is blocked one address at a time

The blacklist compares the whole value, not a part of it. To cut off an entire domain you must add every address separately. Against bulk spam, form protection is more effective than the blacklist.

Unblocking#

Use odstranit on the row. The entry disappears and the value works again.

In bulk: tick the rows and use odstranit označené below the table.

When blocking has no effect#

In order:

  1. Does the value match exactly? The whole string is compared, but letter case does not matter — Novak@firma.cz and novak@firma.cz are the same value to the database. An extra space or a typo does make them differ, though.
  2. Did they change address? Registering with a new email bypasses the blacklist.
  3. Do they have a different IP? Mobile connections change address several times a day.
  4. Are they already signed in? The blacklist stops new access; an existing account is disabled with the Aktivní toggle.

What the blacklist does not solve#

It is not protection against bots or bulk spam — form protection handles that. The blacklist is a tool for a specific recurring case you know about.