diff --git a/internal/config/boolstamp.go b/internal/config/boolstamp.go
index 1c5a6f9..7244e3d 100644
--- a/internal/config/boolstamp.go
+++ b/internal/config/boolstamp.go
@@ -14,7 +14,7 @@ type boolStamp struct {
 
 var _ customType = (*boolStamp)(nil)
 
-func (bs boolStamp) Marshal() string {
+func (bs *boolStamp) Marshal() string {
 	if bs.stamp > 0 {
 		return bs.stamp.String()
 	}
diff --git a/internal/config/config.go b/internal/config/config.go
index bc00063..bf5c424 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -25,6 +25,8 @@ func (c config) Marshal(dst map[string]string) error {
 		dst[c.Name] = strconv.FormatBool(v)
 	case string:
 		dst[c.Name] = v
+	case customType:
+		dst[c.Name] = v.Marshal()
 	default:
 		return cchat.ErrInvalidConfigAtField{
 			Key: c.Name,
@@ -50,7 +52,6 @@ func (c *config) Unmarshal(src map[string]string) (err error) {
 		c.Value = strVal
 	case customType:
 		err = v.Unmarshal(strVal)
-		c.Value = v
 	default:
 		err = fmt.Errorf("unknown type %T", c.Value)
 	}
@@ -81,7 +82,7 @@ func (reg *registry) Configuration() (map[string]string, error) {
 	reg.mutex.RLock()
 	defer reg.mutex.RUnlock()
 
-	var configMap = map[string]string{}
+	configMap := make(map[string]string, len(reg.configs))
 
 	for _, config := range reg.configs {
 		if err := config.Marshal(configMap); err != nil {
diff --git a/internal/config/world.go b/internal/config/world.go
index 4d24193..34225ca 100644
--- a/internal/config/world.go
+++ b/internal/config/world.go
@@ -17,7 +17,7 @@ var world = &registry{
 
 // MentionOnReply returns true if message replies should mention users.
 func MentionOnReply(timestamp time.Time) bool {
-	v := world.get(0).(boolStamp)
+	v := world.get(0).(*boolStamp)
 
 	if v.stamp > 0 {
 		return timestamp.Add(v.stamp).Before(time.Now())
diff --git a/internal/discord/message/author.go b/internal/discord/message/author.go
index 165cffc..b68fa8a 100644
--- a/internal/discord/message/author.go
+++ b/internal/discord/message/author.go
@@ -60,13 +60,25 @@ func richUser(rich *text.Rich, user *mention.User) (start, end int) {
 	return
 }
 
+// ID returns the author's ID. The ID may not be a valid Discord user ID if the
+// user is not a valid (real) user (e.g. webhooks).
 func (a Author) ID() cchat.ID {
-	return a.user.UserID().String()
+	user := a.user.User()
+
+	id := user.ID.String()
+
+	// Treat pseudo-users specially.
+	if user.Discriminator == "0000" {
+		id += "_" + user.Username
+	}
+
+	return id
 }
 
 // Name subscribes the author to the global name label registry.
 func (a Author) Name(_ context.Context, l cchat.LabelContainer) (func(), error) {
-	return a.state.Labels.AddMemberLabel(a.user.GuildID(), a.user.UserID(), l), nil
+	l.SetLabel(a.name)
+	return func() {}, nil
 }
 
 const authorReplyingTo = " replying to "
diff --git a/internal/discord/session/channel/messenger/messenger.go b/internal/discord/session/channel/messenger/messenger.go
index 7786f44..91b5e91 100644
--- a/internal/discord/session/channel/messenger/messenger.go
+++ b/internal/discord/session/channel/messenger/messenger.go
@@ -2,7 +2,6 @@ package messenger
 
 import (
 	"context"
-	"sort"
 
 	"github.com/diamondburned/arikawa/v2/discord"
 	"github.com/diamondburned/arikawa/v2/gateway"
@@ -38,7 +37,7 @@ func (msgr *Messenger) JoinServer(ctx context.Context, ct cchat.MessagesContaine
 		return nil, err
 	}
 
-	var addcancel = funcutil.NewCancels()
+	addcancel := funcutil.NewCancels()
 
 	if msgr.GuildID.IsValid() {
 		// Subscribe to typing events.
@@ -62,19 +61,9 @@ func (msgr *Messenger) JoinServer(ctx context.Context, ct cchat.MessagesContaine
 		}))
 	}
 
-	// Only do all this if we even have any messages.
-	if len(m) > 0 {
-		// Sort messages chronologically using the ID so that the oldest messages
-		// (ones with the smallest snowflake) is in front.
-		sort.Slice(m, func(i, j int) bool { return m[i].ID < m[j].ID })
-
-		// Iterate from the earliest messages to the latest messages.
-		for _, m := range m {
-			ct.CreateMessage(message.NewBacklogMessage(m, msgr.State))
-		}
-
-		// Mark this channel as read.
-		msgr.State.ReadState.MarkRead(msgr.ID, m[len(m)-1].ID)
+	// Iterate from the earliest messages to the latest messages.
+	for _, m := range m {
+		ct.CreateMessage(message.NewBacklogMessage(m, msgr.State))
 	}
 
 	// Bind the handler.
@@ -82,7 +71,6 @@ func (msgr *Messenger) JoinServer(ctx context.Context, ct cchat.MessagesContaine
 		msgr.State.AddHandler(func(m *gateway.MessageCreateEvent) {
 			if m.ChannelID == msgr.ID {
 				ct.CreateMessage(message.NewGuildMessageCreate(m, msgr.State))
-				msgr.State.ReadState.MarkRead(msgr.ID, m.ID)
 			}
 		}),
 		msgr.State.AddHandler(func(m *gateway.MessageUpdateEvent) {
diff --git a/internal/segments/mention/user.go b/internal/segments/mention/user.go
index 920f621..555cbcd 100644
--- a/internal/segments/mention/user.go
+++ b/internal/segments/mention/user.go
@@ -52,13 +52,22 @@ func NewMemberText(s *ningen.State, g discord.GuildID, u discord.UserID) text.Ri
 // NewUserText creates a new rich text describing a Discord user using the
 // Presence API.
 func NewUserText(s *ningen.State, u discord.UserID) text.Rich {
+	var discordUser discord.User
+
 	p, err := s.Presence(0, u)
 	if err != nil {
-		return text.Plain(u.Mention())
+		ready := s.Ready()
+		if ready.User.ID != u {
+			return text.Plain("Unknown user " + u.String())
+		}
+
+		discordUser = ready.User
 	}
 
-	user := NewUser(p.User)
-	user.WithPresence(*p)
+	user := NewUser(discordUser)
+	if p != nil {
+		user.WithPresence(*p)
+	}
 	user.WithState(s)
 	user.Prefetch()
 
@@ -71,7 +80,7 @@ func NewUserText(s *ningen.State, u discord.UserID) text.Rich {
 		},
 	}
 
-	if p.User.Bot {
+	if discordUser.Bot {
 		rich.Content += " "
 		rich.Segments = append(rich.Segments,
 			colored.NewBlurple(segutil.Write(&rich, "[BOT]")),
@@ -164,11 +173,8 @@ func (um *User) Prefetch() {
 
 // DisplayName returns either the nickname or the username.
 func (um *User) DisplayName() string {
-	if um.guildID.IsValid() {
-		m, err := um.store.Member(um.guildID, um.user.ID)
-		if err == nil && m.Nick != "" {
-			return m.Nick
-		}
+	if m := um.getMember(); m != nil && m.Nick != "" {
+		return m.Nick
 	}
 
 	return um.user.Username
@@ -310,7 +316,9 @@ func (um *User) getGuild() *discord.Guild {
 }
 
 func (um *User) getMember() *discord.Member {
-	if !um.guildID.IsValid() {
+	// 0000 isn't a valid discriminator; the user is probably a webhook.
+	// Fallback to the actual user.
+	if !um.guildID.IsValid() || (um.user.Discriminator == "0000" && um.user.Bot) {
 		return nil
 	}
 
@@ -327,6 +335,7 @@ func (um *User) getMember() *discord.Member {
 		return nil
 	}
 
+	um.user = m.User
 	um.member = m
 	return m
 }