smtp error, how to resolve

[adi100]

time="2021-04-10T10:15:53Z" level=error msg="failed to send email to client" err="x509: certificate relies on legacy Common Name field, use SANs or temporarily enable Common Name matching with GODEBUG=x509ignoreCN=0"

[vx3r]

what is your smtp server ? is the server properly configured ?

[duoduo]

  - SMTP_HOST=smtp-mail.outlook.com
  - SMTP_PORT=587
  - SMTP_USERNAME=******@outlook.com
  - SMTP_PASSWORD=******
  - SMTP_FROM=Wg Gen Web <******@outlook.com>

Error: 500 - Internal Server Error: