Email Ouput: AUTH Unrecognized authentication type

Hi Logstash team,

I have been using Logstash 7.4.2 version without problem with output email plugin
I updated ELK stack version to 7.5.2 in last week due to some Vulnerability.
But i am facing the bellow errors when try to send a notification email.

Has any breaking change which related to this problem?
i am researching about it, and read logstash release notes but has no related issue.

Is this one issue which may be caused?

Thanks and looking forward to your answer.

Something happen while delivering an email {:exception=>#<Net::SMTPAuthenticationError: 504 5.7.4 Unrecognized authentication type

[2020-01-27T07:46:25,753][ERROR][ ] Something happen while delivering an email {:exception=>#<Net::SMTPAuthenticationError: 504 5.3.3 AUTH mechanism PLAIN not available


Something happen while delivering an email {:exception=>#<OpenSSL::SSL::SSLError: hostname "xxxx" does not match the server certificate>}

  • Version: 7.5.2
  • Platform: Docker
  • Operating System: Linux, SMTP (Not required Authentication)
  • Config File (if you have sensitive info, please remove it):
    Mail output:
email {
    from =>
    body => "Mail content"
    to => ""
    subject => "System notification"
    codec => "plain"
    contenttype => "text/plain; charset=UTF-8"

    #SMTP server
    address => ""
    port => 25

* Sample Log:
`SMTPAuthenticationError: 504 5.7.4 Unrecongnized authentication type`

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