Jatin :
Here is a peculiar problem. The intention is to send a mail via SMTP for office365.
I have been able to consistently send mail from my local laptop.
But when deployed on our server (behind a firewall), it does not succeed. Note: The port 587 for smtp.office365.com is accessible and confirmed on the server. Here are the properties via which it successfully works from my local computer.
Properties props = new Properties();
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.connectiontimeout", MAIL_TIMEOUT);
props.put("mail.smtp.timeout", MAIL_TIMEOUT);
props.put("mail.debug", true);
this.session = Session.getInstance(props);
session.setDebug(true);
Transport transport = session.getTransport();
transport.connect("smtp.office365.com", 587, email, pass);
But fails on server. Here are the server debug logs:
DEBUG: setDebug: JavaMail version 1.6.2
DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle]
DEBUG SMTP: useEhlo true, useAuth false
DEBUG SMTP: trying to connect to host "smtp.office365.com", port 587, isSSL false
220 PN1PR0101CA0017.outlook.office365.com Microsoft ESMTP MAIL Service ready at Fri, 28 Jun 2019 06:39:41 +0000
DEBUG SMTP: connected to host "smtp.office365.com", port: 587
EHLO appqa
250-PN1PR0101CA0017.outlook.office365.com Hello [182.73.191.100]
250-SIZE 157286400
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-STARTTLS
250-8BITMIME
250-BINARYMIME
250-CHUNKING
250 SMTPUTF8
DEBUG SMTP: Found extension "SIZE", arg "157286400"
DEBUG SMTP: Found extension "PIPELINING", arg ""
DEBUG SMTP: Found extension "DSN", arg ""
DEBUG SMTP: Found extension "ENHANCEDSTATUSCODES", arg ""
DEBUG SMTP: Found extension "STARTTLS", arg ""
DEBUG SMTP: Found extension "8BITMIME", arg ""
DEBUG SMTP: Found extension "BINARYMIME", arg ""
DEBUG SMTP: Found extension "CHUNKING", arg ""
DEBUG SMTP: Found extension "SMTPUTF8", arg ""
STARTTLS
220 2.0.0 SMTP server ready
Exception in thread "main" javax.mail.MessagingException: Could not convert socket to TLS;
nested exception is:
java.net.SocketTimeoutException: Read timed out
at com.sun.mail.smtp.SMTPTransport.startTLS(SMTPTransport.java:2155)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:752)
at javax.mail.Service.connect(Service.java:366)
at com.company.app.MailReader.getTransport(MailReader.java:269)
at io.vavr.control.Try.of(Try.java:75)
at com.company.app.MailReader.<init>(MailReader.java:59)
at com.company.services.MailService.getNewMailReader(MailService.java:82)
at com.company.services.MailService.start(MailService.java:46)
at com.company.Main.main(Main.java:34)
Caused by: java.net.SocketTimeoutException: Read timed out
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
at java.net.SocketInputStream.read(SocketInputStream.java:171)
at java.net.SocketInputStream.read(SocketInputStream.java:141)
at sun.security.ssl.InputRecord.readFully(InputRecord.java:465)
at sun.security.ssl.InputRecord.readV3Record(InputRecord.java:593)
at sun.security.ssl.InputRecord.read(InputRecord.java:529)
at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:975)
at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1367)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1395)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1379)
at com.sun.mail.util.SocketFetcher.configureSSLSocket(SocketFetcher.java:626)
at com.sun.mail.util.SocketFetcher.startTLS(SocketFetcher.java:553)
at com.sun.mail.smtp.SMTPTransport.startTLS(SMTPTransport.java:2150)
... 8 more
Jatin :
The problem was one particular rule in firewall.
Deleting the rule in the firewall fixed this issue. No specific code change was needed to make it work.