Added email functionality

backend/app/services/email_service.py

@@ -0,0 +1,33 @@
+## Copyright © 2026 Olaf Kolkman
+## SPDX-License-Identifier: GPL-3.0-or-later
+
+from email.message import EmailMessage
+from smtplib import SMTP
+
+from backend.app.core.config import settings
+
+
+def smtp_configured() -> bool:
+    return bool(settings.smtp_host and settings.smtp_from)
+
+
+def send_verification_email(email: str, username: str, verification_url: str) -> None:
+    if not smtp_configured():
+        raise RuntimeError('SMTP is not configured; set LINKLOG_SMTP_HOST and LINKLOG_SMTP_FROM')
+
+    message = EmailMessage()
+    message['Subject'] = 'Verify your LinkLog email address'
+    message['From'] = settings.smtp_from
+    message['To'] = email
+    message.set_content(
+        f'Hello {username},\n\n'
+        f'Verify your LinkLog email address by opening this link:\n{verification_url}\n\n'
+        f'This link expires in {settings.email_verification_expiry_hours} hours.\n'
+    )
+
+    with SMTP(settings.smtp_host, settings.smtp_port, timeout=10) as smtp:
+        if settings.smtp_use_tls:
+            smtp.starttls()
+        if settings.smtp_username:
+            smtp.login(settings.smtp_username, settings.smtp_password)
+        smtp.send_message(message)