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.
See the reference documentation for a detailed explanation of how you can use
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
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 spring.mail.properties.mail.smtp.timeout=3000 spring.mail.properties.mail.smtp.writetimeout=5000
It is also possible to configure a
JavaMailSender with an existing
Session from JNDI:
jndi-name is set, it takes precedence over all other Session-related settings.