java - Bulk Emails failed with 421 4.7.0 Try again later -


i have requirement send bulk emails in organization. java mail api , sending mails below config.

        props.put("mail.transport.protocol", "smtp");         props.put("mail.smtp.auth", "true");         props.put("mail.smtp.starttls.enable", "true");         props.put("mail.smtp.host", "smtp.gmail.com");         props.put("mail.smtp.port", "587");

mail#1 from: abc@org.com to: emp1@org.com

mail#2 from: abc@org.com to: emp2@org.com

...

mails triggered in loop.

problem: first 80 emails sent successfully. 81st mail failing below error 10-15 emails , later few mails sent successfully.

out of 743 emails 400 failed & 343 success. 

    info   | jvm 1    | 2017/08/18 07:25:54 | com.sun.mail.smtp.smtpsendfailedexception: 421 4.7.0 try again later, closing connection. (mail) xsdsfasdsa.96 - gsmtp     info   | jvm 1    | 2017/08/18 07:25:54 |      info   | jvm 1    | 2017/08/18 07:25:54 |   @ com.sun.mail.smtp.smtptransport.issuesendcommand(smtptransport.java:2108)     info   | jvm 1    | 2017/08/18 07:25:54 |   @ com.sun.mail.smtp.smtptransport.mailfrom(smtptransport.java:1609)     info   | jvm 1    | 2017/08/18 07:25:54 |   @ com.sun.mail.smtp.smtptransport.sendmessage(smtptransport.java:1117)
  1. help me how resolve it.
  2. is there specific per minute limit on smtp.gmail.com?

thanks, rana


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