diff --git a/controller/limits/accountWarningAction.go b/controller/limits/accountWarningAction.go
index a799b423..7595c15f 100644
--- a/controller/limits/accountWarningAction.go
+++ b/controller/limits/accountWarningAction.go
@@ -23,26 +23,30 @@ func newAccountWarningAction(cfg *emailUi.Config, str *store.Store, edge *rest_m
 func (a *accountWarningAction) HandleAccount(acct *store.Account, rxBytes, txBytes int64, limit *BandwidthPerPeriod, trx *sqlx.Tx) error {
 	logrus.Infof("warning '%v'", acct.Email)
 
-	rxLimit := "(unlimited bytes)"
-	if limit.Limit.Rx != Unlimited {
-		rxLimit = util.BytesToSize(limit.Limit.Rx)
-	}
-	txLimit := "(unlimited bytes)"
-	if limit.Limit.Tx != Unlimited {
-		txLimit = util.BytesToSize(limit.Limit.Tx)
-	}
-	totalLimit := "(unlimited bytes)"
-	if limit.Limit.Total != Unlimited {
-		totalLimit = util.BytesToSize(limit.Limit.Total)
-	}
+	if a.cfg != nil {
+		rxLimit := "(unlimited bytes)"
+		if limit.Limit.Rx != Unlimited {
+			rxLimit = util.BytesToSize(limit.Limit.Rx)
+		}
+		txLimit := "(unlimited bytes)"
+		if limit.Limit.Tx != Unlimited {
+			txLimit = util.BytesToSize(limit.Limit.Tx)
+		}
+		totalLimit := "(unlimited bytes)"
+		if limit.Limit.Total != Unlimited {
+			totalLimit = util.BytesToSize(limit.Limit.Total)
+		}
 
-	detail := newDetailMessage()
-	detail = detail.append("Your account has received %v and sent %v (for a total of %v), which has triggered a transfer limit warning.", util.BytesToSize(rxBytes), util.BytesToSize(txBytes), util.BytesToSize(rxBytes+txBytes))
-	detail = detail.append("This zrok instance only allows an account to receive %v, send %v, totalling not more than %v for each %v.", rxLimit, txLimit, totalLimit, limit.Period)
-	detail = detail.append("If you exceed the transfer limit, access to your shares will be temporarily disabled (until the last %v falls below the transfer limit)", limit.Period)
+		detail := newDetailMessage()
+		detail = detail.append("Your account has received %v and sent %v (for a total of %v), which has triggered a transfer limit warning.", util.BytesToSize(rxBytes), util.BytesToSize(txBytes), util.BytesToSize(rxBytes+txBytes))
+		detail = detail.append("This zrok instance only allows an account to receive %v, send %v, totalling not more than %v for each %v.", rxLimit, txLimit, totalLimit, limit.Period)
+		detail = detail.append("If you exceed the transfer limit, access to your shares will be temporarily disabled (until the last %v falls below the transfer limit)", limit.Period)
 
-	if err := sendLimitWarningEmail(a.cfg, acct.Email, detail); err != nil {
-		return errors.Wrapf(err, "error sending limit warning email to '%v'", acct.Email)
+		if err := sendLimitWarningEmail(a.cfg, acct.Email, detail); err != nil {
+			return errors.Wrapf(err, "error sending limit warning email to '%v'", acct.Email)
+		}
+	} else {
+		logrus.Warnf("skipping warning email for account limit; no email configuration specified")
 	}
 
 	return nil
diff --git a/controller/limits/environmentWarningAction.go b/controller/limits/environmentWarningAction.go
index 120af20d..b8bcb3db 100644
--- a/controller/limits/environmentWarningAction.go
+++ b/controller/limits/environmentWarningAction.go
@@ -23,33 +23,37 @@ func newEnvironmentWarningAction(cfg *emailUi.Config, str *store.Store, edge *re
 func (a *environmentWarningAction) HandleEnvironment(env *store.Environment, rxBytes, txBytes int64, limit *BandwidthPerPeriod, trx *sqlx.Tx) error {
 	logrus.Infof("warning '%v'", env.ZId)
 
-	if env.AccountId != nil {
-		acct, err := a.str.GetAccount(*env.AccountId, trx)
-		if err != nil {
-			return err
-		}
+	if a.cfg != nil {
+		if env.AccountId != nil {
+			acct, err := a.str.GetAccount(*env.AccountId, trx)
+			if err != nil {
+				return err
+			}
 
-		rxLimit := "unlimited bytes"
-		if limit.Limit.Rx != Unlimited {
-			rxLimit = util.BytesToSize(limit.Limit.Rx)
-		}
-		txLimit := "unlimited bytes"
-		if limit.Limit.Tx != Unlimited {
-			txLimit = util.BytesToSize(limit.Limit.Tx)
-		}
-		totalLimit := "unlimited bytes"
-		if limit.Limit.Total != Unlimited {
-			totalLimit = util.BytesToSize(limit.Limit.Total)
-		}
+			rxLimit := "unlimited bytes"
+			if limit.Limit.Rx != Unlimited {
+				rxLimit = util.BytesToSize(limit.Limit.Rx)
+			}
+			txLimit := "unlimited bytes"
+			if limit.Limit.Tx != Unlimited {
+				txLimit = util.BytesToSize(limit.Limit.Tx)
+			}
+			totalLimit := "unlimited bytes"
+			if limit.Limit.Total != Unlimited {
+				totalLimit = util.BytesToSize(limit.Limit.Total)
+			}
 
-		detail := newDetailMessage()
-		detail = detail.append("Your environment '%v' has received %v and sent %v (for a total of %v), which has triggered a transfer limit warning.", env.Description, util.BytesToSize(rxBytes), util.BytesToSize(txBytes), util.BytesToSize(rxBytes+txBytes))
-		detail = detail.append("This zrok instance only allows a share to receive %v, send %v, totalling not more than %v for each %v.", rxLimit, txLimit, totalLimit, limit.Period)
-		detail = detail.append("If you exceed the transfer limit, access to your shares will be temporarily disabled (until the last %v falls below the transfer limit).", limit.Period)
+			detail := newDetailMessage()
+			detail = detail.append("Your environment '%v' has received %v and sent %v (for a total of %v), which has triggered a transfer limit warning.", env.Description, util.BytesToSize(rxBytes), util.BytesToSize(txBytes), util.BytesToSize(rxBytes+txBytes))
+			detail = detail.append("This zrok instance only allows a share to receive %v, send %v, totalling not more than %v for each %v.", rxLimit, txLimit, totalLimit, limit.Period)
+			detail = detail.append("If you exceed the transfer limit, access to your shares will be temporarily disabled (until the last %v falls below the transfer limit).", limit.Period)
 
-		if err := sendLimitWarningEmail(a.cfg, acct.Email, detail); err != nil {
-			return errors.Wrapf(err, "error sending limit warning email to '%v'", acct.Email)
+			if err := sendLimitWarningEmail(a.cfg, acct.Email, detail); err != nil {
+				return errors.Wrapf(err, "error sending limit warning email to '%v'", acct.Email)
+			}
 		}
+	} else {
+		logrus.Warnf("skipping warning email for environment limit; no email configuration specified")
 	}
 
 	return nil
diff --git a/controller/limits/shareWarningAction.go b/controller/limits/shareWarningAction.go
index 5781a284..3b2af3a0 100644
--- a/controller/limits/shareWarningAction.go
+++ b/controller/limits/shareWarningAction.go
@@ -23,38 +23,42 @@ func newShareWarningAction(cfg *emailUi.Config, str *store.Store, edge *rest_man
 func (a *shareWarningAction) HandleShare(shr *store.Share, rxBytes, txBytes int64, limit *BandwidthPerPeriod, trx *sqlx.Tx) error {
 	logrus.Infof("warning '%v'", shr.Token)
 
-	env, err := a.str.GetEnvironment(shr.EnvironmentId, trx)
-	if err != nil {
-		return err
-	}
-
-	if env.AccountId != nil {
-		acct, err := a.str.GetAccount(*env.AccountId, trx)
+	if a.cfg != nil {
+		env, err := a.str.GetEnvironment(shr.EnvironmentId, trx)
 		if err != nil {
 			return err
 		}
 
-		rxLimit := "unlimited bytes"
-		if limit.Limit.Rx != Unlimited {
-			rxLimit = util.BytesToSize(limit.Limit.Rx)
-		}
-		txLimit := "unlimited bytes"
-		if limit.Limit.Tx != Unlimited {
-			txLimit = util.BytesToSize(limit.Limit.Tx)
-		}
-		totalLimit := "unlimited bytes"
-		if limit.Limit.Total != Unlimited {
-			totalLimit = util.BytesToSize(limit.Limit.Total)
-		}
+		if env.AccountId != nil {
+			acct, err := a.str.GetAccount(*env.AccountId, trx)
+			if err != nil {
+				return err
+			}
 
-		detail := newDetailMessage()
-		detail = detail.append("Your share '%v' has received %v and sent %v (for a total of %v), which has triggered a transfer limit warning.", shr.Token, util.BytesToSize(rxBytes), util.BytesToSize(txBytes), util.BytesToSize(rxBytes+txBytes))
-		detail = detail.append("This zrok instance only allows a share to receive %v, send %v, totalling not more than %v for each %v.", rxLimit, txLimit, totalLimit, limit.Period)
-		detail = detail.append("If you exceed the transfer limit, access to your shares will be temporarily disabled (until the last %v falls below the transfer limit).", limit.Period)
+			rxLimit := "unlimited bytes"
+			if limit.Limit.Rx != Unlimited {
+				rxLimit = util.BytesToSize(limit.Limit.Rx)
+			}
+			txLimit := "unlimited bytes"
+			if limit.Limit.Tx != Unlimited {
+				txLimit = util.BytesToSize(limit.Limit.Tx)
+			}
+			totalLimit := "unlimited bytes"
+			if limit.Limit.Total != Unlimited {
+				totalLimit = util.BytesToSize(limit.Limit.Total)
+			}
 
-		if err := sendLimitWarningEmail(a.cfg, acct.Email, detail); err != nil {
-			return errors.Wrapf(err, "error sending limit warning email to '%v'", acct.Email)
+			detail := newDetailMessage()
+			detail = detail.append("Your share '%v' has received %v and sent %v (for a total of %v), which has triggered a transfer limit warning.", shr.Token, util.BytesToSize(rxBytes), util.BytesToSize(txBytes), util.BytesToSize(rxBytes+txBytes))
+			detail = detail.append("This zrok instance only allows a share to receive %v, send %v, totalling not more than %v for each %v.", rxLimit, txLimit, totalLimit, limit.Period)
+			detail = detail.append("If you exceed the transfer limit, access to your shares will be temporarily disabled (until the last %v falls below the transfer limit).", limit.Period)
+
+			if err := sendLimitWarningEmail(a.cfg, acct.Email, detail); err != nil {
+				return errors.Wrapf(err, "error sending limit warning email to '%v'", acct.Email)
+			}
 		}
+	} else {
+		logrus.Warnf("skipping warning email for share limit; no email configuration specified")
 	}
 
 	return nil