Recently, I have been using the email sending function. I always encountered problems, and I found it later. It was not caused by program problems.
javax.mail.sendfaileDexception: Sending failed; nested exception is: class javax.mail.MessagingException: 554 mi: STC 0, DSCOWLC7LWPACZRN7 qcqaa-. 2883s2 1295256512 at javax.mail.transport.send0 (transport.java:218) at javax.mail.Trail.trasport.Send (Transport.java:80) at mbspublic.mail.sendmail.sendmsg_mediaSet (sendmail.java:1302) ain (sendmail.java:1962)
In fact, this problem is the 163 server problem. Your mailing has an excessive rate and is temporarily restricted.