diff --git a/.idea/codeStyles/Project.xml b/.idea/codeStyles/Project.xml
index f26eeb33..9f37145b 100644
--- a/.idea/codeStyles/Project.xml
+++ b/.idea/codeStyles/Project.xml
@@ -16,7 +16,6 @@
       <option name="BLANK_LINES_AFTER_CLASS_HEADER" value="1" />
     </codeStyleSettings>
     <codeStyleSettings language="XML">
-      <option name="FORCE_REARRANGE_MODE" value="0" />
       <arrangement>
         <rules />
       </arrangement>
diff --git a/src/main/java/org/asamk/Signal.java b/src/main/java/org/asamk/Signal.java
index 6fb59303..6c819eef 100644
--- a/src/main/java/org/asamk/Signal.java
+++ b/src/main/java/org/asamk/Signal.java
@@ -24,6 +24,10 @@ public interface Signal extends DBusInterface {
 
     void setContactName(String number, String name);
 
+    void blockContact(String number);
+
+    void unblockContact(String number);
+
     List<byte[]> getGroupIds();
 
     String getGroupName(byte[] groupId);
diff --git a/src/main/java/org/asamk/signal/commands/BlockContactCommand.java b/src/main/java/org/asamk/signal/commands/BlockContactCommand.java
new file mode 100644
index 00000000..92de4750
--- /dev/null
+++ b/src/main/java/org/asamk/signal/commands/BlockContactCommand.java
@@ -0,0 +1,29 @@
+package org.asamk.signal.commands;
+
+import net.sourceforge.argparse4j.inf.Namespace;
+import net.sourceforge.argparse4j.inf.Subparser;
+import org.asamk.signal.manager.Manager;
+
+public class BlockContactCommand implements LocalCommand {
+
+    @Override
+    public void attachToSubparser(final Subparser subparser) {
+        subparser.addArgument("number")
+                .help("Contact number");
+        subparser.help("Block the given contact (no messages will be received)");
+    }
+
+    @Override
+    public int handleCommand(final Namespace ns, final Manager m) {
+        if (!m.isRegistered()) {
+            System.err.println("User is not registered.");
+            return 1;
+        }
+
+        String number = ns.getString("number");
+
+        m.blockContact(number);
+
+        return 0;
+    }
+}
diff --git a/src/main/java/org/asamk/signal/commands/Commands.java b/src/main/java/org/asamk/signal/commands/Commands.java
index aa53d339..563b5263 100644
--- a/src/main/java/org/asamk/signal/commands/Commands.java
+++ b/src/main/java/org/asamk/signal/commands/Commands.java
@@ -9,6 +9,7 @@ public class Commands {
 
     static {
         addCommand("addDevice", new AddDeviceCommand());
+        addCommand("blockContact", new BlockContactCommand());
         addCommand("daemon", new DaemonCommand());
         addCommand("link", new LinkCommand());
         addCommand("listContacts", new ListContactsCommand());
@@ -25,6 +26,7 @@ public class Commands {
         addCommand("updateContact", new UpdateContactCommand());
         addCommand("setPin", new SetPinCommand());
         addCommand("trust", new TrustCommand());
+        addCommand("unblockContact", new UnblockContactCommand());
         addCommand("unregister", new UnregisterCommand());
         addCommand("updateAccount", new UpdateAccountCommand());
         addCommand("updateGroup", new UpdateGroupCommand());
diff --git a/src/main/java/org/asamk/signal/commands/UnblockContactCommand.java b/src/main/java/org/asamk/signal/commands/UnblockContactCommand.java
new file mode 100644
index 00000000..af44e638
--- /dev/null
+++ b/src/main/java/org/asamk/signal/commands/UnblockContactCommand.java
@@ -0,0 +1,29 @@
+package org.asamk.signal.commands;
+
+import net.sourceforge.argparse4j.inf.Namespace;
+import net.sourceforge.argparse4j.inf.Subparser;
+import org.asamk.signal.manager.Manager;
+
+public class UnblockContactCommand implements LocalCommand {
+
+    @Override
+    public void attachToSubparser(final Subparser subparser) {
+        subparser.addArgument("number")
+                .help("Contact number");
+        subparser.help("Unblock the given contact (messages will be received again)");
+    }
+
+    @Override
+    public int handleCommand(final Namespace ns, final Manager m) {
+        if (!m.isRegistered()) {
+            System.err.println("User is not registered.");
+            return 1;
+        }
+
+        String number = ns.getString("number");
+
+        m.unblockContact(number);
+
+        return 0;
+    }
+}
diff --git a/src/main/java/org/asamk/signal/manager/Manager.java b/src/main/java/org/asamk/signal/manager/Manager.java
index 54d3f922..2fffcc16 100644
--- a/src/main/java/org/asamk/signal/manager/Manager.java
+++ b/src/main/java/org/asamk/signal/manager/Manager.java
@@ -686,6 +686,36 @@ public class Manager implements Signal {
         account.save();
     }
 
+    @Override
+    public void blockContact(String number) {
+        ContactInfo contact = account.getContactStore().getContact(number);
+        if (contact == null) {
+            contact = new ContactInfo();
+            contact.number = number;
+            System.err.println("Adding and blocking contact " + number);
+        } else {
+            System.err.println("Blocking contact " + number);
+        }
+        contact.blocked = true;
+        account.getContactStore().updateContact(contact);
+        account.save();
+    }
+
+    @Override
+    public void unblockContact(String number) {
+        ContactInfo contact = account.getContactStore().getContact(number);
+        if (contact == null) {
+            contact = new ContactInfo();
+            contact.number = number;
+            System.err.println("Adding and unblocking contact " + number);
+        } else {
+            System.err.println("Unblocking contact " + number);
+        }
+        contact.blocked = false;
+        account.getContactStore().updateContact(contact);
+        account.save();
+    }
+
     @Override
     public List<byte[]> getGroupIds() {
         List<GroupInfo> groups = getGroups();
diff --git a/src/main/java/org/asamk/signal/storage/contacts/ContactInfo.java b/src/main/java/org/asamk/signal/storage/contacts/ContactInfo.java
index 291303b2..be69b40c 100644
--- a/src/main/java/org/asamk/signal/storage/contacts/ContactInfo.java
+++ b/src/main/java/org/asamk/signal/storage/contacts/ContactInfo.java
@@ -19,6 +19,9 @@ public class ContactInfo {
     @JsonProperty
     public String profileKey;
 
+    @JsonProperty(defaultValue = "false")
+    public boolean blocked;
+
     @JsonIgnore
     public SignalServiceAddress getAddress() {
         return new SignalServiceAddress(null, number);