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ORA-29278: SMTP transient error: 421 Service not available

guest1991May 27 2016 — edited Feb 8 2017

I am trying to send email from my application. I am using APEX 5.0 and my OS is Windows 10.

First I set the ACL and set the process as Send E-mail on my application. There is no error in the application, but once I check APEX_MAIL_QUEUE, I saw SMTP transient error. So, I tried to set the email address and port for SMTP and I made sure that SMTP is running (Control Panel -> Adminstrative Tools -> IIS Manager -> SMTP E-Mail). But I still get the same error here.

Does anyone here knows how to fix this?

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Locked on Jun 24 2016

Added on May 27 2016

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