[GitHub] izenk opened a new issue #2625: Could not connect to SMTP host

[GitBox <gi...@apache.org>]

izenk opened a new issue #2625: Could not connect to SMTP host
URL: https://github.com/apache/cloudstack/issues/2625
 
 
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   #### ISSUE TYPE
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   **Other**
   
   
   #### COMPONENT NAME
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   **Management Node**
   
   #### CLOUDSTACK VERSION
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   **4.11.0**
   
   #### CONFIGURATION
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   * **Advanced Networking**
   * **KVM**
   
   #### OS / ENVIRONMENT
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   Information about the environment if relevant, N/A otherwise
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   **CentOS Linux release 7.4.1708**
   
   #### Summary
   Goal: integrate CloudStack with external SMTP relay.
   SMTP relay is Office365 relay from Office365 subscription.
   Parameters to connect: smtp.office365.com:587
   
   In general there are two cases for secure connection:
   * SSL (First SSL handshake, then SMTP HELO)
   * TLS (First SMTP HELO, then STARTLS)
   
   CS does not allow to specify method to use and by default use SSL, what leads to errors:
   ~~~
   2018-04-25 13:32:59,733 ERROR [c.c.a.AlertManagerImpl] (Email-Alerts-Sender-1:null) (logid:)  Failed to send email alert javax.mail.Mes
   sagingException: Could not connect to SMTP host: smtp.office365.com, port: 587;
     nested exception is:
           javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?
   ~~~

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