com.sun.mail.smtp.SMTPSendFailedException Javamail

Question

I try to send an email using javaMail version 1.5.5, I got this SMTPSendFailedException and I don't know why.

Here a part of the exception:

com.sun.mail.smtp.SMTPSendFailedException: 555 5.5.2 Syntax error. w133sm10373661ywa.37 - gsmtp

at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:1388)
at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:1388)
at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:959)
at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:583)

My properties are:

Properties props = new Properties();

props.put("mail.smtp.host", "smtp.gmail.com");

    props.setProperty("mail.smtp.starttls.enable", "true");

    props.setProperty("mail.smtp.port", "587");

    props.setProperty("mail.smtp.user", "user";

    props.setProperty("mail.smtp.auth", "true");

    props.setProperty("mail.smtp.ssl.enable", "false");

    props.setProperty("mail.session.mail.smtp.auth.mechanisms", "LOGIN");
    props.setProperty("mail.session.mail.smtp.auth.plain.disable", "false");

    props.setProperty("mail.session.mail.smtp.starttls.enable", "false");
    props.put("mail.smtp.connectiontimeout", 6000);

Answer 1

It doesn't like your From address. When you constructed the message, did you use the setFrom method? What address did you supply?

It might help to see the JavaMail debug output showing exactly what's being sent to the server.

Also, those mail.session.* properties are not valid JavaMail properties. Did you expect JavaMail to look at them or are you using them for some other purpose?