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Editorial Team
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Asked: 2026-05-20T10:51:46+00:00

(If this is a duplicate question, please send me a link to the appropriate

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(If this is a duplicate question, please send me a link to the appropriate thread.)

I wrote a Java program using JavaMail API to send an email to several users through Gmail and it worked perfectly. However, when I tried to use the same code (with slight modification) to use MS Exchange Server to send emails, the program hangs.

It did not throw any exceptions, so I am assuming that it is able to make the connection. (I had tried using other ports or wrong SMTP address and it gave me a ‘Connection refused’ exception.)

This was the last statement and the program does not terminate after that:

[DEBUG SMTP: trying to connect to host “[xxx.yyy.com]”, port 135, isSSL false]

Please understand that I do not need help with the code, but I just want to understand what’s going on.

I appreciate your time.

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1 Answer

  1. Editorial Team

    You need to connect to port 25 for SMTP, not port 135. (SMTPs is port 465.)

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