Unencrypted SMTP server connection not available

[ChucklezPC2]

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🛡️ Security Policy

• I have read and agree to Uptime Kuma's Security Policy.

📝 Description

When trying to use an SMTP server that does not have any encryption protocols available, error occurs.

👟 Reproduction steps

Setup new Email/SMTP Notification.

• Host: Point to SMTP server that does not support TLS
• Port: 25
• Security: None / STARTTLS (25, 587)

👀 Expected behavior

Notification setup properly ignores TLS and/or does not look for it. Emails send through unencrypted SMTP server properly.

😓 Actual Behavior

App is using a setting that is expecting TLS, thus rejecting the notificaiotn setup.

Error Message: "Error upgrading connection with STARTTLS: 454 4.7.0 TLS not available due to local problem"

🐻 Uptime-Kuma Version

1.23.16

💻 Operating System and Arch

Windows 11

🌐 Browser

Brave (latest version)

🖥️ Deployment Environment

• Runtime Environment:
  • Docker: Version X.X.X (Build Y.Y.Y)
  • Docker Compose: Version X.X.X
  • Portainer (BE/CE): Version X.X.X (LTS: Yes/No)
  • MariaDB: Version X.X.X (LTS: Yes/No)
  • Node.js: Version X.X.X (LTS: Yes/No)
  • Kubernetes (K3S/K8S): Version X.X.X (LTS: Yes/No, via [method/tool])
• Database:
  • SQLite: Embedded
  • MariaDB: Embedded/External
• Database Storage:
  • Filesystem:
    • Linux: ext4/XFS/Btrfs/ZFS/F2FS
    • macOS: APFS/ HFS+
    • Windows: NTFS/ReFS
  • Storage Medium: HDD/eMMC/SSD/NVMe
• Uptime Kuma Setup:
  • Number of monitors: X

📝 Relevant log output