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Editorial Team
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Asked: 2026-05-17T01:24:19+00:00

I’m using JavaMail to send email requests to an SMTP server. I would like

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I’m using JavaMail to send email requests to an SMTP server.

I would like to set both “mail.smtp.connectiontimeout” and “mail.smtp.timeout” properties within my code.

Programmatically, I want to catch both when timeout and/or connectiontimeout operations are reached in Java and handle things accordingly. Handling in the sense, I need to retry the same email once again the next time.

How do I handle this in Java/JavaMail? Is it possible to catch & handle this timeout operations?

EDIT

Also, is it possible to simulate/reproduce this timeout operation on my own assuming I’ve complete administration access to the SMTP server?

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1 Answer

  1. Editorial Team

    Answering your second question: On your test machine just DROP all outgoing connections to your SMTP Server with iptables:

       iptables -I OUTPUT 1 -p tcp -s 192.168.1.20 --dport 25 -j DROP

    This way it does look like an unresponsive smtp server and you can test your exception handling.

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