diff --git a/src/CommandFormats.hh b/src/CommandFormats.hh
index adbd4931..3e3a7b8e 100644
--- a/src/CommandFormats.hh
+++ b/src/CommandFormats.hh
@@ -1043,6 +1043,15 @@ struct SC_SimpleMail_81 {
 struct SC_SimpleMail_PC_81 : SC_SimpleMail_81<char16_t> { };
 struct SC_SimpleMail_V3_81 : SC_SimpleMail_81<char> { };
 
+struct SC_SimpleMail_BB_81 {
+  le_uint32_t player_tag;
+  le_uint32_t from_guild_card_number;
+  ptext<char16_t, 0x10> from_name;
+  le_uint32_t to_guild_card_number;
+  ptext<char16_t, 0x14> received_date;
+  ptext<char16_t, 0x200> text;
+};
+
 // 82: Invalid command
 
 // 83 (S->C): Lobby menu
diff --git a/src/ReceiveCommands.cc b/src/ReceiveCommands.cc
index 16c88398..03105bef 100644
--- a/src/ReceiveCommands.cc
+++ b/src/ReceiveCommands.cc
@@ -1848,6 +1848,11 @@ void process_simple_mail(shared_ptr<ServerState> s, shared_ptr<Client> c,
     to_guild_card_number = cmd.to_guild_card_number;
     message = cmd.text;
 
+  } else if (c->version == GameVersion::BB) {
+    const auto& cmd = check_size_t<SC_SimpleMail_BB_81>(data);
+    to_guild_card_number = cmd.to_guild_card_number;
+    message = cmd.text;
+
   } else {
     // TODO
     send_text_message(c, u"$C6Simple Mail is not\nsupported yet on\nthis platform.");
diff --git a/src/SendCommands.cc b/src/SendCommands.cc
index 7603bd6c..c37d48f4 100644
--- a/src/SendCommands.cc
+++ b/src/SendCommands.cc
@@ -566,6 +566,21 @@ void send_simple_mail_t(
   send_command_t(c, 0x81, 0x00, cmd);
 }
 
+void send_simple_mail_bb(
+    shared_ptr<Client> c,
+    uint32_t from_guild_card_number,
+    const u16string& from_name,
+    const u16string& text) {
+  SC_SimpleMail_BB_81 cmd;
+  cmd.player_tag = 0x00010000;
+  cmd.from_guild_card_number = from_guild_card_number;
+  cmd.from_name = from_name;
+  cmd.to_guild_card_number = c->license->serial_number;
+  cmd.received_date = decode_sjis(format_time(now()));
+  cmd.text = text;
+  send_command_t(c, 0x81, 0x00, cmd);
+}
+
 void send_simple_mail(shared_ptr<Client> c, uint32_t from_guild_card_number,
     const u16string& from_name, const u16string& text) {
   if ((c->version == GameVersion::GC) || (c->version == GameVersion::XB)) {
@@ -574,6 +589,8 @@ void send_simple_mail(shared_ptr<Client> c, uint32_t from_guild_card_number,
   } else if (c->version == GameVersion::PC) {
     send_simple_mail_t<SC_SimpleMail_PC_81>(
         c, from_guild_card_number, from_name, text);
+  } else if (c->version == GameVersion::BB) {
+    send_simple_mail_bb(c, from_guild_card_number, from_name, text);
   } else {
     throw logic_error("unimplemented versioned command");
   }