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Sending Email

The Spring Framework provides an abstraction for sending email by using the JavaMailSender interface, and Spring Boot provides auto-configuration for it as well as a starter module.

Tip
 See the {spring-framework-docs}/integration.html#mail[reference documentation] for a detailed explanation of how you can use JavaMailSender.

If spring.mail.host and the relevant libraries (as defined by spring-boot-starter-mail) are available, a default JavaMailSender is created if none exists. The sender can be further customized by configuration items from the spring.mail namespace. See {spring-boot-autoconfigure-module-code}/mail/MailProperties.java[MailProperties] for more details.

In particular, certain default timeout values are infinite, and you may want to change that to avoid having a thread blocked by an unresponsive mail server, as shown in the following example:

spring:
  mail:
    properties:
      "[mail.smtp.connectiontimeout]": 5000
      "[mail.smtp.timeout]": 3000
      "[mail.smtp.writetimeout]": 5000

It is also possible to configure a JavaMailSender with an existing Session from JNDI:

spring:
  mail:
    jndi-name: "mail/Session"

When a jndi-name is set, it takes precedence over all other Session-related settings.