diff --git a/src/CommandFormats.hh b/src/CommandFormats.hh
index 7fd60d59..dde7b3ea 100644
--- a/src/CommandFormats.hh
+++ b/src/CommandFormats.hh
@@ -1781,13 +1781,17 @@ struct S_ChoiceSearchResultEntry_V3_C4 {
 // client_id field in each entry before sending.
 
 // C6 (C->S): Set blocked senders list (V3/BB)
+// The command always contains the same number of entries, even if the entries
+// at the end are blank (zero).
 
-struct C_SetBlockedSenders_V3_BB_C6 {
-  // The command always contains 30 entries, even if the entries at the end are
-  // blank (zero).
-  parray<le_uint32_t, 30> blocked_senders;
+template <size_t Count>
+struct C_SetBlockedSenders_C6 {
+  parray<le_uint32_t, Count> blocked_senders;
 };
 
+struct C_SetBlockedSenders_V3_C6 : C_SetBlockedSenders_C6<30> { };
+struct C_SetBlockedSenders_BB_C6 : C_SetBlockedSenders_C6<28> { };
+
 // C7 (C->S): Enable simple mail auto-reply (V3/BB)
 // Same format as 1A/D5 command (plain text).
 // Server does not respond
@@ -2299,7 +2303,7 @@ struct C_DeleteGuildCard_BB_05E8_08E8 {
   le_uint32_t guild_card_number;
 };
 
-// 06E8 (C->S): Set guild card text
+// 06E8 (C->S): Update (overwrite) guild card
 // Format is GuildCardBB (see Player.hh)
 
 // 07E8 (C->S): Add blocked user
diff --git a/src/Player.cc b/src/Player.cc
index d6a84b26..5fcec9a4 100644
--- a/src/Player.cc
+++ b/src/Player.cc
@@ -271,14 +271,14 @@ GuildCardV3::GuildCardV3() noexcept
   : player_tag(0),
     guild_card_number(0),
     present(0),
-    present2(0),
+    language(0),
     section_id(0),
     char_class(0) { }
 
 GuildCardBB::GuildCardBB() noexcept
   : guild_card_number(0),
     present(0),
-    present2(0),
+    language(0),
     section_id(0),
     char_class(0) { }
 
@@ -288,7 +288,7 @@ void GuildCardBB::clear() {
   this->team_name.clear();
   this->description.clear();
   this->present = 0;
-  this->present2 = 0;
+  this->language = 0;
   this->section_id = 0;
   this->char_class = 0;
 }
diff --git a/src/Player.hh b/src/Player.hh
index 8a4b9e50..3fea0cf8 100644
--- a/src/Player.hh
+++ b/src/Player.hh
@@ -215,7 +215,7 @@ struct GuildCardV3 {
   ptext<char, 0x18> name;
   ptext<char, 0x6C> description;
   uint8_t present; // should be 1
-  uint8_t present2; // should be 1
+  uint8_t language;
   uint8_t section_id;
   uint8_t char_class;
 
@@ -229,7 +229,7 @@ struct GuildCardBB {
   ptext<char16_t, 0x10> team_name;
   ptext<char16_t, 0x58> description;
   uint8_t present; // should be 1 if guild card entry exists
-  uint8_t present2; // should be 1 if guild card entry exists
+  uint8_t language;
   uint8_t section_id;
   uint8_t char_class;
 
@@ -248,8 +248,10 @@ struct GuildCardEntryBB {
 
 // the format of the BB guild card file
 struct GuildCardFileBB {
-  parray<uint8_t, 0x1F74> unknown_a3;
-  GuildCardEntryBB entries[0x0069]; // that's 105 of them in decimal
+  parray<uint8_t, 0x114> unknown_a1;
+  GuildCardBB blocked[0x1C];
+  parray<uint8_t, 0x180> unknown_a2;
+  GuildCardEntryBB entries[0x69];
 } __attribute__((packed));
 
 struct KeyAndTeamConfigBB {
diff --git a/src/ReceiveCommands.cc b/src/ReceiveCommands.cc
index 1f2ac075..26e6fe76 100644
--- a/src/ReceiveCommands.cc
+++ b/src/ReceiveCommands.cc
@@ -1583,7 +1583,8 @@ void process_player_preview_request_bb(shared_ptr<ServerState>, shared_ptr<Clien
 
 void process_client_checksum_bb(shared_ptr<ServerState>, shared_ptr<Client> c,
     uint16_t command, uint32_t, const string& data) {
-  constexpr size_t max_count = sizeof(GuildCardFileBB) / sizeof(GuildCardEntryBB);
+  constexpr size_t max_count = sizeof(GuildCardFileBB::entries) / sizeof(GuildCardEntryBB);
+  constexpr size_t max_blocked = sizeof(GuildCardFileBB::blocked) / sizeof(GuildCardBB);
   switch (command) {
     case 0x01E8: { // Check guild card file checksum
       check_size_v(data.size(), sizeof(C_GuildCardChecksum_01E8));
@@ -1615,20 +1616,17 @@ void process_client_checksum_bb(shared_ptr<ServerState>, shared_ptr<Client> c,
     case 0x05E8: { // Delete guild card
       auto& cmd = check_size_t<C_DeleteGuildCard_BB_05E8_08E8>(data);
       auto& gcf = c->game_data.account()->guild_cards;
-      size_t z;
-      for (z = 0; z < max_count; z++) {
+      for (size_t z = 0; z < max_count; z++) {
         if (gcf.entries[z].data.guild_card_number == cmd.guild_card_number) {
+          c->log.info("Deleted guild card %" PRIu32 " at position %zu",
+              cmd.guild_card_number.load(), z);
+          for (z = 0; z < max_count - 1; z++) {
+            gcf.entries[z] = gcf.entries[z + 1];
+          }
+          gcf.entries[max_count - 1].clear();
           break;
         }
       }
-      if (z < max_count) {
-        c->log.info("Deleted guild card %" PRIu32 " at position %zu",
-            cmd.guild_card_number.load(), z);
-        for (z = 0; z < max_count - 1; z++) {
-          gcf.entries[z] = gcf.entries[z + 1];
-        }
-        gcf.entries[max_count - 1].clear();
-      }
       break;
     }
     case 0x06E8: { // Update guild card
@@ -1644,15 +1642,36 @@ void process_client_checksum_bb(shared_ptr<ServerState>, shared_ptr<Client> c,
       break;
     }
     case 0x07E8: { // Add blocked user
-      // TODO: Where do these go in GuildCardFileBB?
-      // auto& cmd = check_size_t<C_DeleteGuildCard_BB_05E8_08E8>(data);
-      throw runtime_error("blocked users are not yet implemented on BB");
+      auto& new_gc = check_size_t<GuildCardBB>(data);
+      auto& gcf = c->game_data.account()->guild_cards;
+      for (size_t z = 0; z < max_blocked; z++) {
+        if (!gcf.blocked[z].present) {
+          gcf.blocked[z] = new_gc;
+          c->log.info("Added blocked guild card %" PRIu32 " at position %zu",
+              new_gc.guild_card_number.load(), z);
+          // Note: The client also sends a C6 command, so we don't have to
+          // manually sync the actual blocked senders list here
+          break;
+        }
+      }
       break;
     }
     case 0x08E8: { // Delete blocked user
-      // TODO: Where do these go in GuildCardFileBB?
-      // auto& cmd = check_size_t<C_DeleteGuildCard_BB_05E8_08E8>(data);
-      throw runtime_error("blocked users are not yet implemented on BB");
+      auto& cmd = check_size_t<C_DeleteGuildCard_BB_05E8_08E8>(data);
+      auto& gcf = c->game_data.account()->guild_cards;
+      for (size_t z = 0; z < max_blocked; z++) {
+        if (gcf.blocked[z].guild_card_number == cmd.guild_card_number) {
+          c->log.info("Deleted blocked guild card %" PRIu32 " at position %zu",
+              cmd.guild_card_number.load(), z);
+          for (z = 0; z < max_blocked - 1; z++) {
+            gcf.blocked[z] = gcf.blocked[z + 1];
+          }
+          gcf.blocked[max_blocked - 1].clear();
+          // Note: The client also sends a C6 command, so we don't have to
+          // manually sync the actual blocked senders list here
+          break;
+        }
+      }
       break;
     }
     case 0x09E8: { // Write comment
@@ -1932,8 +1951,13 @@ void process_disable_auto_reply(shared_ptr<ServerState>, shared_ptr<Client> c,
 
 void process_set_blocked_senders_list(shared_ptr<ServerState>, shared_ptr<Client> c,
     uint16_t, uint32_t, const string& data) { // C6
-  const auto& cmd = check_size_t<C_SetBlockedSenders_V3_BB_C6>(data);
-  c->game_data.account()->blocked_senders = cmd.blocked_senders;
+  if (c->version == GameVersion::BB) {
+    const auto& cmd = check_size_t<C_SetBlockedSenders_BB_C6>(data);
+    c->game_data.account()->blocked_senders = cmd.blocked_senders;
+  } else {
+    const auto& cmd = check_size_t<C_SetBlockedSenders_V3_C6>(data);
+    c->game_data.account()->blocked_senders = cmd.blocked_senders;
+  }
 }