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Editorial Team
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Asked: 2026-05-18T22:04:24+00:00

I was wondering if anyone might be able to explain to me why it’s

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I was wondering if anyone might be able to explain to me why it’s taking nearly 30 seconds each time my Java web app sends an email using Gmail’s SMTP server? See the following timestamps:

13/04/2010-22:24:27:281 DEBUG test.service.impl.SynchronousEmailService – Before sending mail.
13/04/2010-22:24:52:625 DEBUG test.service.impl.SynchronousEmailService – After sending mail.

I’m using spring’s JavaMailSender class with the following settings:

email.host=smtp.gmail.com

email.username=myaccount@gmail.com
email.password=mypassword
email.port=465
mail.smtp.auth.required=true

Note that the mail is getting sent and I’m receiving it fine, there’s just this delay which is resulting in a slow experience for the application user.

If you know how I can diagnose the problem myself that would be good too 🙂

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1 Answer

  1. Editorial Team

    It might be that gmail uses this delay to prevent spammers from using their SMTP server from the “outside”: if the SMTP is called from the actual webmail client it would not use this delay.
    In order to test this, you could open a telnet session to port 25 and do a manual SMTP session
    (Search the web for SMTP HELO for examples)

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