From a098825fcc49e5fcff628d296ca922138ec197d5 Mon Sep 17 00:00:00 2001
From: AuditAIH <145266260+AuditAIH@users.noreply.github.com>
Date: Wed, 25 Jun 2025 13:50:35 +0800
Subject: [PATCH] Update smtp.py (#21335)

---
 api/libs/smtp.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/api/libs/smtp.py b/api/libs/smtp.py
index 35561f071..b94386660 100644
--- a/api/libs/smtp.py
+++ b/api/libs/smtp.py
@@ -22,7 +22,11 @@ class SMTPClient:
             if self.use_tls:
                 if self.opportunistic_tls:
                     smtp = smtplib.SMTP(self.server, self.port, timeout=10)
+                    # Send EHLO command with the HELO domain name as the server address
+                    smtp.ehlo(self.server)
                     smtp.starttls()
+                    # Resend EHLO command to identify the TLS session
+                    smtp.ehlo(self.server)
                 else:
                     smtp = smtplib.SMTP_SSL(self.server, self.port, timeout=10)
             else: