Allow configuration of Custom E-Mail provider

[Terminatorthre]

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Description

Okta now allows configuring and using your own E-Mail infrastucture by providing SMTP credentials and server. This is currently not possible with the terraform provider.

New or Affected Resource(s)

• okta_email_custom_provider

References

Okta provides an official API to manage E-Mail server configuration https://developer.okta.com/docs/api/openapi/okta-management/management/tag/EmailServer/

[duytiennguyen-okta]

OKTA internal reference https://oktainc.atlassian.net/browse/OKTA-717448