diff --git a/fluxer_gateway/src/push/push_message_params.erl b/fluxer_gateway/src/push/push_message_params.erl
index 846b40ee3..cc0f2e36c 100644
--- a/fluxer_gateway/src/push/push_message_params.erl
+++ b/fluxer_gateway/src/push/push_message_params.erl
@@ -8,6 +8,9 @@
 -export_type([context/0]).
 
 -define(MAX_GUILD_FEATURES, 64).
+-define(MESSAGE_TYPE_DEFAULT, 0).
+-define(MESSAGE_TYPE_REPLY, 19).
+-define(PUSHABLE_MESSAGE_TYPES, [?MESSAGE_TYPE_DEFAULT, ?MESSAGE_TYPE_REPLY]).
 
 -type context() :: #{
     message_data := map(),
@@ -110,7 +113,24 @@ validate(#{message_id := undefined}) ->
 validate(#{guild_default_notifications := undefined}) ->
     {error, invalid_guild_default_notifications};
 validate(Context) ->
-    {ok, Context}.
+    validate_message_type(message_type(Context), Context).
+
+-spec validate_message_type(integer(), context()) -> {ok, context()} | {error, term()}.
+validate_message_type(Type, Context) ->
+    case lists:member(Type, ?PUSHABLE_MESSAGE_TYPES) of
+        true -> {ok, Context};
+        false -> {error, {unpushable_message_type, Type}}
+    end.
+
+-spec message_type(context()) -> integer().
+message_type(#{message_data := MessageData}) ->
+    normalize_message_type(maps:get(<<"type">>, MessageData, ?MESSAGE_TYPE_DEFAULT)).
+
+-spec normalize_message_type(term()) -> integer().
+normalize_message_type(Type) when is_integer(Type) ->
+    Type;
+normalize_message_type(_Type) ->
+    ?MESSAGE_TYPE_DEFAULT.
 
 -spec owner_fallback_key(map()) -> term().
 owner_fallback_key(Params) ->
@@ -163,3 +183,51 @@ markdown_context(MessageData, GuildId, RoleNames, _RawContext) when
     push_notification_format:build_markdown_context(MessageData, GuildId, RoleNames, #{});
 markdown_context(_MessageData, _GuildId, _RoleNames, RawContext) ->
     optional_map(RawContext).
+
+-ifdef(TEST).
+-include_lib("eunit/include/eunit.hrl").
+
+params_with_message_type(Type) ->
+    #{
+        message_data => #{
+            <<"channel_id">> => <<"1472201127385612376">>,
+            <<"id">> => <<"1472201127385612377">>,
+            <<"type">> => Type
+        },
+        user_ids => [<<"1474262819227156566">>],
+        guild_id => <<"1472200708085309475">>,
+        author_id => <<"1472583967301656587">>,
+        guild_default_notifications => 0
+    }.
+
+context_allows_a_default_message_test() ->
+    ?assertMatch({ok, _}, context(params_with_message_type(?MESSAGE_TYPE_DEFAULT))).
+
+context_allows_a_reply_test() ->
+    ?assertMatch({ok, _}, context(params_with_message_type(?MESSAGE_TYPE_REPLY))).
+
+context_rejects_a_call_system_message_test() ->
+    ?assertEqual(
+        {error, {unpushable_message_type, 3}}, context(params_with_message_type(3))
+    ).
+
+context_rejects_every_non_authored_message_type_test() ->
+    lists:foreach(
+        fun(Type) ->
+            ?assertEqual(
+                {error, {unpushable_message_type, Type}},
+                context(params_with_message_type(Type))
+            )
+        end,
+        [1, 2, 3, 4, 5, 6, 7, 99]
+    ).
+
+context_treats_a_missing_message_type_as_pushable_test() ->
+    Params = params_with_message_type(?MESSAGE_TYPE_DEFAULT),
+    MessageData = maps:remove(<<"type">>, maps:get(message_data, Params)),
+    ?assertMatch({ok, _}, context(Params#{message_data := MessageData})).
+
+context_treats_a_malformed_message_type_as_pushable_test() ->
+    ?assertMatch({ok, _}, context(params_with_message_type(<<"nonsense">>))).
+
+-endif.
diff --git a/fluxer_gateway/src/push/push_notification_format.erl b/fluxer_gateway/src/push/push_notification_format.erl
index 8203d2129..81f0d44b1 100644
--- a/fluxer_gateway/src/push/push_notification_format.erl
+++ b/fluxer_gateway/src/push/push_notification_format.erl
@@ -33,7 +33,7 @@ build_content_preview(MessageData, MarkdownContext) ->
     Preview = push_markdown_plaintext:render_push_preview(Content, MarkdownContext),
     case Preview of
         <<>> ->
-            truncate_preview(build_content_fallback_preview(MessageData));
+            truncate_preview(build_content_fallback_preview(MessageData, MarkdownContext));
         _ ->
             truncate_preview(Preview)
     end.
@@ -372,13 +372,37 @@ valid_utf8_prefix(Content) ->
         {error, Valid, _Rest} -> Valid
     end.
 
--spec build_content_fallback_preview(map()) -> binary().
-build_content_fallback_preview(MessageData) ->
+-spec build_content_fallback_preview(map(), map()) -> binary().
+build_content_fallback_preview(MessageData, MarkdownContext) ->
     case
         first_nonempty_binary([
             build_sticker_preview(maps:get(<<"stickers">>, MessageData, [])),
             build_attachment_preview(maps:get(<<"attachments">>, MessageData, [])),
-            build_embed_preview(maps:get(<<"embeds">>, MessageData, []))
+            build_embed_preview(maps:get(<<"embeds">>, MessageData, [])),
+            build_snapshot_preview(
+                maps:get(<<"message_snapshots">>, MessageData, []), MarkdownContext
+            )
+        ])
+    of
+        Preview when is_binary(Preview) -> Preview;
+        undefined -> <<>>
+    end.
+
+-spec build_snapshot_preview(term(), map()) -> binary().
+build_snapshot_preview([Snapshot | _Rest], MarkdownContext) when is_map(Snapshot) ->
+    snapshot_preview(Snapshot, MarkdownContext);
+build_snapshot_preview(_Snapshots, _MarkdownContext) ->
+    <<>>.
+
+-spec snapshot_preview(map(), map()) -> binary().
+snapshot_preview(Snapshot, MarkdownContext) ->
+    Content = push_utils:normalize_binary(maps:get(<<"content">>, Snapshot, <<>>), <<>>),
+    case
+        first_nonempty_binary([
+            push_markdown_plaintext:render_push_preview(Content, MarkdownContext),
+            build_sticker_preview(maps:get(<<"stickers">>, Snapshot, [])),
+            build_attachment_preview(maps:get(<<"attachments">>, Snapshot, [])),
+            build_embed_preview(maps:get(<<"embeds">>, Snapshot, []))
         ])
     of
         Preview when is_binary(Preview) -> Preview;
@@ -639,6 +663,48 @@ truncate_preview_keeps_short_valid_content_identical_test() ->
     Content = <<"hello \xC3\xA9 world">>,
     ?assertEqual(Content, truncate_preview(Content)).
 
+a_forwarded_message_previews_its_snapshot_content_test() ->
+    MessageData = #{
+        <<"content">> => <<>>,
+        <<"message_snapshots">> => [#{<<"content">> => <<"forwarded text">>}]
+    },
+    ?assertEqual(<<"forwarded text">>, build_content_preview(MessageData)).
+
+a_forwarded_attachment_previews_its_filename_test() ->
+    MessageData = #{
+        <<"content">> => <<>>,
+        <<"message_snapshots">> => [
+            #{<<"content">> => null, <<"attachments">> => [#{<<"filename">> => <<"cat.png">>}]}
+        ]
+    },
+    ?assertEqual(<<"Attachment: cat.png">>, build_content_preview(MessageData)).
+
+a_forwarded_sticker_previews_its_name_test() ->
+    MessageData = #{
+        <<"content">> => <<>>,
+        <<"message_snapshots">> => [
+            #{<<"content">> => null, <<"stickers">> => [#{<<"name">> => <<"Wave">>}]}
+        ]
+    },
+    ?assertEqual(<<"Sticker: Wave">>, build_content_preview(MessageData)).
+
+own_content_wins_over_a_snapshot_test() ->
+    MessageData = #{
+        <<"content">> => <<"my words">>,
+        <<"message_snapshots">> => [#{<<"content">> => <<"forwarded text">>}]
+    },
+    ?assertEqual(<<"my words">>, build_content_preview(MessageData)).
+
+an_empty_snapshot_list_previews_nothing_test() ->
+    ?assertEqual(
+        <<>>, build_content_preview(#{<<"content">> => <<>>, <<"message_snapshots">> => []})
+    ).
+
+a_null_snapshot_field_previews_nothing_test() ->
+    ?assertEqual(
+        <<>>, build_content_preview(#{<<"content">> => <<>>, <<"message_snapshots">> => null})
+    ).
+
 build_url_dm_test() ->
     ?assertEqual(<<"/channels/@me/456/789">>, build_url(0, 456, 789)).