无法在Digital Ocean服务器中发送电子邮件

Question

我有一个存储在数字海洋中的应用程序，之前已存储在其他服务器中。 在我的应用正常发送电子邮件之前，现在出现错误：我已经检查了firewal内容，iptables配置，更改端口等。在我的本地环境中，电子邮件正常传输，如果我将其部署回旧服务器，则电子邮件正常传输。 还有什么呢？

org.apache.commons.mail.EmailException: Sending the email to the following server failed :      smtp-mail.outlook.com:25
at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1410)
at org.apache.commons.mail.Email.send(Email.java:1437)
at br.com.caelum.vraptor.simplemail.DefaultMailer.wrapUpAndSend(DefaultMailer.java:74)
at br.com.caelum.vraptor.simplemail.DefaultMailer.send(DefaultMailer.java:63)
at br.com.caelum.vraptor.simplemail.DefaultAsyncMailer$1.call(DefaultAsyncMailer.java:54)
at br.com.caelum.vraptor.simplemail.DefaultAsyncMailer$1.call(DefaultAsyncMailer.java:49)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: javax.mail.MessagingException: Could not connect to SMTP host: smtp-mail.outlook.com, port: 25;
nested exception is:
java.net.SocketTimeoutException: connect timed out
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1961)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:654)
at javax.mail.Service.connect(Service.java:317)
at javax.mail.Service.connect(Service.java:176)
at javax.mail.Service.connect(Service.java:125)
at javax.mail.Transport.send0(Transport.java:194)
at javax.mail.Transport.send(Transport.java:124)
at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1400)
... 9 more
Caused by: java.net.SocketTimeoutException: connect timed out
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:319)
at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:237)
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1927)

Answer 1

在联系了数字海洋支持人员并打开通知该问题的票证后，我得知，他们默认情况下为新帐户激活了一个垃圾邮件阻止程序，这是验证所有者身份的必要联系人。