JavaMail : Limitations on the count for sending mails
email, jakarta-mail, smtp
Solution
All of those numbers depend on the server. JavaMail imposes no limits other than available memory.
Problem
Limitations on the count for sending emails using JavaMail - What is the maximum number of emails can be present in the to/cc/bcc list? - What is the maximum number of emails that can be sent in a Session? Does these numbers depend on the SMTP server configuration?