only 3 thread to access spring service layer at a time while keeping other request in buffer

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We have an utility for sending an email to customers. Currently we are using outlook for sending an emails, But once we send multiple email at a time we get the following error msg.

DEBUG SMTP: MessagingException while sending
com.sun.mail.smtp.SMTPSendFailedException: 432 4.3.2 STOREDRV.ClientSubmit; sender thread limit exceeded

After debugging its found that we can't send 3 mails at a time. So thought another approach to send msgs by queuing the request and process the 3 request at a time while keeping other in buffer.

Note: Don't want to use any msq queuing service (like rabbitMQ etc)

Your suggests/inputs will be really helpful for me.

Thanks

rest spring email
1 Answers

If you are using MS Office SMTP (I guess from the error message), there is a limit on concurrent connection.

Documentation

Under the new limit, up to three concurrent connections are allowed to send email messages at the same time.

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