Consider defining a bean of type 'org.springframework.mail.javamail.JavaMailSender' in your configuration.

Sure! To define a bean of type 'org.springframework.mail.javamail.JavaMailSender' in your configuration, you can follow these steps:

1. Make sure you have the necessary dependencies in your project for Spring's Email support and JavaMailSender. You can add the following dependency to your Maven pom.xml file:

   <dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-mail</artifactId>
   </dependency>

2. Create a configuration class or update an existing one to define the JavaMailSender bean. An example configuration class could look like this:

   import org.springframework.context.annotation.Bean;
   import org.springframework.context.annotation.Configuration;
   import org.springframework.mail.javamail.JavaMailSender;
   import org.springframework.mail.javamail.JavaMailSenderImpl;
  
   @Configuration
   public class MailConfig {
   
       @Bean
       public JavaMailSender javaMailSender() {
           JavaMailSenderImpl mailSender = new JavaMailSenderImpl();
           // Set mailSender properties like host, port, username, password, etc.
           mailSender.setHost("your-smtp-host");
           mailSender.setPort(587);
           mailSender.setUsername("your-username");
           mailSender.setPassword("your-password");
           // You can also set other properties like TLS, SSL, etc.
           return mailSender;
       }
   }

3. Customize the properties of the JavaMailSender according to your SMTP server configuration. For example, set the host, port, username, password, etc. based on your SMTP provider's settings.

4. Use the JavaMailSender bean in your code by injecting it into your classes where you need to send emails. For example:

   import org.springframework.beans.factory.annotation.Autowired;
   import org.springframework.mail.SimpleMailMessage;
   import org.springframework.mail.javamail.JavaMailSender;
   import org.springframework.stereotype.Service;
   
   @Service
   public class EmailService {
   
       private final JavaMailSender mailSender;
   
       @Autowired
       public EmailService(JavaMailSender mailSender) {
           this.mailSender = mailSender;
       }
   
       public void sendEmail(String to, String subject, String text) {
           SimpleMailMessage message = new SimpleMailMessage();
           message.setTo(to);
           message.setSubject(subject);
           message.setText(text);
           mailSender.send(message);
       }
   }

That's it! Now you have defined a JavaMailSender bean in your configuration and can use it to send emails in your application. Remember to customize the properties according to your SMTP server settings.