diff --git a/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/mail/MailHealthIndicator.java b/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/mail/MailHealthIndicator.java
index a7abf862f6..08da5072a5 100644
--- a/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/mail/MailHealthIndicator.java
+++ b/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/mail/MailHealthIndicator.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -38,7 +38,9 @@ public class MailHealthIndicator extends AbstractHealthIndicator {
 
 	@Override
 	protected void doHealthCheck(Builder builder) throws Exception {
-		builder.withDetail("location", this.mailSender.getHost() + ":" + this.mailSender.getPort());
+		int port = this.mailSender.getPort();
+		builder.withDetail("location", (port == JavaMailSenderImpl.DEFAULT_PORT) ? this.mailSender.getHost()
+				: this.mailSender.getHost() + ":" + this.mailSender.getPort());
 		this.mailSender.testConnection();
 		builder.up();
 	}
diff --git a/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/mail/MailHealthIndicatorTests.java b/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/mail/MailHealthIndicatorTests.java
index d9e082c065..6ee4bdc7a3 100644
--- a/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/mail/MailHealthIndicatorTests.java
+++ b/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/mail/MailHealthIndicatorTests.java
@@ -56,25 +56,47 @@ class MailHealthIndicatorTests {
 		session.addProvider(new Provider(Type.TRANSPORT, "success", SuccessTransport.class.getName(), "Test", "1.0.0"));
 		this.mailSender = mock(JavaMailSenderImpl.class);
 		given(this.mailSender.getHost()).willReturn("smtp.acme.org");
-		given(this.mailSender.getPort()).willReturn(25);
 		given(this.mailSender.getSession()).willReturn(session);
 		this.indicator = new MailHealthIndicator(this.mailSender);
 	}
 
 	@Test
-	void smtpIsUp() {
+	void smtpOnDefaultPortIsUp() {
+		given(this.mailSender.getPort()).willReturn(-1);
 		given(this.mailSender.getProtocol()).willReturn("success");
 		Health health = this.indicator.health();
 		assertThat(health.getStatus()).isEqualTo(Status.UP);
-		assertThat(health.getDetails()).containsEntry("location", "smtp.acme.org:25");
+		assertThat(health.getDetails()).containsEntry("location", "smtp.acme.org");
 	}
 
 	@Test
-	void smtpIsDown() throws MessagingException {
+	void smtpOnDefaultPortIsDown() throws MessagingException {
+		given(this.mailSender.getPort()).willReturn(-1);
 		willThrow(new MessagingException("A test exception")).given(this.mailSender).testConnection();
 		Health health = this.indicator.health();
 		assertThat(health.getStatus()).isEqualTo(Status.DOWN);
-		assertThat(health.getDetails()).containsEntry("location", "smtp.acme.org:25");
+		assertThat(health.getDetails()).containsEntry("location", "smtp.acme.org");
+		Object errorMessage = health.getDetails().get("error");
+		assertThat(errorMessage).isNotNull();
+		assertThat(errorMessage.toString().contains("A test exception")).isTrue();
+	}
+
+	@Test
+	void smtpOnCustomPortIsUp() {
+		given(this.mailSender.getPort()).willReturn(1234);
+		given(this.mailSender.getProtocol()).willReturn("success");
+		Health health = this.indicator.health();
+		assertThat(health.getStatus()).isEqualTo(Status.UP);
+		assertThat(health.getDetails()).containsEntry("location", "smtp.acme.org:1234");
+	}
+
+	@Test
+	void smtpOnCustomPortIsDown() throws MessagingException {
+		given(this.mailSender.getPort()).willReturn(1234);
+		willThrow(new MessagingException("A test exception")).given(this.mailSender).testConnection();
+		Health health = this.indicator.health();
+		assertThat(health.getStatus()).isEqualTo(Status.DOWN);
+		assertThat(health.getDetails()).containsEntry("location", "smtp.acme.org:1234");
 		Object errorMessage = health.getDetails().get("error");
 		assertThat(errorMessage).isNotNull();
 		assertThat(errorMessage.toString()).contains("A test exception");