Exception in sending email from java via gmail

问题:

I am getting the following exception while trying send an email from java via gmail.

javax.mail.MessagingException: Could not connect to SMTP host: smtp.gmail.com, port: 465;
nested exception is:
java.net.ConnectException: Connection refused: connect
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1391)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:412)
at javax.mail.Service.connect(Service.java:288)
at javax.mail.Service.connect(Service.java:169)
at Mail.Send(Mail.java:75)
at Mail.main(Mail.java:85)
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at sun.security.ssl.SSLSocketImpl.connect(Unknown Source)
at sun.security.ssl.BaseSSLSocketImpl.connect(Unknown Source)
at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:233)
at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:189)
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1359)
... 5 more

I referred http://www.tutorialspoint.com/javamail_api/javamail_api_gmail_smtp_server.htm and Send email using java but same exception is coming both for SSL and TLS. Any fix for this?

Thanks in advance.

回答1:

You will need to enable SMTP access in GMAIL, also you need to allow unsecure clients for your account:

https://www.google.com/settings/security/lesssecureapps

https://support.google.com/mail/answer/75726

Be aware that the smtp port you want to use is open in your firewall! I suggest to try a connection check from the machine where your code is running with Thunderbird if possible. Then you know if the client is able to connect.

回答2:

After you to enable SMTP access in GMAIL, also you need to allow unsecure clients for your account ( as suggested by LucasF) Try this configuration :

host :smtp.gmail.com
port :587
username :[e-mail]
password :yourpassword
   JavaMailProperties : 
     mail.transport.protocol : smtp
     mail.smtp.auth : true
     mail.smtp.starttls.enable :true
     mail.debug :true

Me I use this configuration with import org.springframework.mail.SimpleMailMessage class and it's works.