Brunda10 commented on issue #54690:
URL: https://github.com/apache/airflow/issues/54690#issuecomment-3242039709

   
   Expected in Airflow 3.x: SMTP connections must be explicitly defined via 
smtp_default or AIRFLOW__EMAIL__EMAIL_CONN_ID.
   
   For port 587, STARTTLS is used, so {"starttls": true, "disable_ssl": true} 
in conn-extra is required.
   
   For port 465, implicit SSL is used, so {"ssl": true, "disable_tls": true}  
is needed.
   
   No code changes were made; the issue is resolved by configuring the 
connection correctly.


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