Add SslBundle support to MailSender

See gh-40037

spring-boot-project/spring-boot-tools/spring-boot-test-support-docker/src/main/java/org/springframework/boot/testsupport/container/MailpitContainer.java

@@ -0,0 +1,78 @@
+/*
+ * Copyright 2012-2024 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.testsupport.container;
+
+import org.testcontainers.containers.GenericContainer;
+import org.testcontainers.utility.DockerImageName;
+import org.testcontainers.utility.MountableFile;
+
+/**
+ * A {@link GenericContainer} for MailDev.
+ *
+ * @author Rui Figueira
+ */
+public class MailpitContainer extends GenericContainer<MailpitContainer> {
+
+	private static final int DEFAULT_SMTP_PORT = 1025;
+
+	private static final int DEFAULT_POP3_PORT = 1110;
+
+	public MailpitContainer(DockerImageName dockerImageName) {
+		super(dockerImageName);
+		addExposedPorts(DEFAULT_SMTP_PORT, DEFAULT_POP3_PORT);
+	}
+
+	public int getSmtpPort() {
+		return getMappedPort(DEFAULT_SMTP_PORT);
+	}
+
+	public int getPop3Port() {
+		return getMappedPort(DEFAULT_POP3_PORT);
+	}
+
+	public MailpitContainer withSmtpTlsCert(MountableFile cert) {
+		this.withCopyFileToContainer(cert, "/tmp/ssl/public.crt");
+		this.withEnv("MP_SMTP_TLS_CERT", "/tmp/ssl/public.crt");
+		return this.self();
+	}
+
+	public MailpitContainer withSmtpTlsKey(MountableFile key) {
+		this.withCopyFileToContainer(key, "/tmp/ssl/private.key");
+		this.withEnv("MP_SMTP_TLS_KEY", "/tmp/ssl/private.key");
+		return this.self();
+	}
+
+	public MailpitContainer withSmtpRequireTls(boolean requireTls) {
+		if (requireTls) {
+			this.withEnv("MP_SMTP_REQUIRE_TLS", "true");
+		}
+		return this.self();
+	}
+
+	public MailpitContainer withSmtpRequireStarttls(boolean requireStarttls) {
+		if (requireStarttls) {
+			this.withEnv("MP_SMTP_REQUIRE_STARTTLS", "true");
+		}
+		return this.self();
+	}
+
+	public MailpitContainer withPop3Auth(String... auths) {
+		this.withEnv("MP_POP3_AUTH", String.join(" ", auths));
+		return this.self();
+	}
+
+}

spring-boot-project/spring-boot-tools/spring-boot-test-support-docker/src/main/java/org/springframework/boot/testsupport/container/TestImage.java

@@ -110,6 +110,11 @@ public enum TestImage {
 	 */
 	OPEN_LDAP("osixia/openldap", "1.5.0", () -> OpenLdapContainer.class),
 
+	/**
+	 * A container image suitable for testing SMTP.
+	 */
+	MAILPIT("axllent/mailpit", "v1.19.0", () -> MailpitContainer.class),
+
 	/**
 	 * A container image suitable for testing MariaDB.
 	 */