diff --git a/extensions/mailer/runtime/src/main/java/io/quarkus/mailer/runtime/Mailers.java b/extensions/mailer/runtime/src/main/java/io/quarkus/mailer/runtime/Mailers.java
index 4239dd46abaac5..ce3b238a4f32ed 100644
--- a/extensions/mailer/runtime/src/main/java/io/quarkus/mailer/runtime/Mailers.java
+++ b/extensions/mailer/runtime/src/main/java/io/quarkus/mailer/runtime/Mailers.java
@@ -128,7 +128,8 @@ public void stop() {
 
     private MailClient createMailClient(Vertx vertx, MailerRuntimeConfig config, TlsConfig tlsConfig) {
         io.vertx.ext.mail.MailConfig cfg = toVertxMailConfig(config, tlsConfig);
-        return MailClient.createShared(vertx, cfg);
+        // Do not create a shared instance, as we want separated connection pool for each SMTP servers.
+        return MailClient.create(vertx, cfg);
     }
 
     private io.vertx.ext.mail.DKIMSignOptions toVertxDkimSignOptions(DkimSignOptionsConfig optionsConfig) {