fix: use SMTP without starttls

config_templates/perun.proxygui.yaml

@@ -211,8 +211,8 @@ gui:
     all_mails_attribute: "urn:perun:user:attribute-def:virt:tcsMails:mu" # OPTIONAL mails where notification about the MFA reset will be sent if configured
     helpdesk_mail: "it@muni.cz" # REQUIRED mail where request to reset MFA will be forwarded after being confirmed by the user
     mail_login_credentials_filepath: path_to_credentials # OPTIONAL credentials to email from which the MFA reset link and notifications will be sent in a newline-delimited file like username<\n>password, the username is also used as the FROM address
-    smtp_server: smtp.example.com # REQUIRED server from which the signed emails will be sent
-    smtp_port: 487
+    smtp_server: smtp.example.com # REQUIRED server from which the signed emails will be sent over plain SMTP (MTA)
+    smtp_port: 25
     cert_filepath: certificate_filepath # REQUIRED for S/MIME signatures used in emails
     private_key_filepath: private_key_filepath # REQUIRED for S/MIME signatures used in emails
     mfa_reset_translations: # OPTIONAL: options below need to be filled out in order for mfa-reset page text to appear

perun/utils/EmailService.py

@@ -33,9 +33,6 @@ class EmailService:
 
     def __send_email_message(self, message: MIMEMultipart) -> None:
         with smtplib.SMTP(self.__SMTP_SERVER, self.__SMTP_PORT) as smtp_server:
-            smtp_server.ehlo()
-            smtp_server.starttls()
-            smtp_server.ehlo()
             if self.__LOGIN_EMAIL and self.__LOGIN_PASS:
                 smtp_server.login(self.__LOGIN_EMAIL, self.__LOGIN_PASS)
             smtp_server.send_message(message)