diff --git a/server/routers/authentication.py b/server/routers/authentication.py
index e612e57..c1473bd 100644
--- a/server/routers/authentication.py
+++ b/server/routers/authentication.py
@@ -1,5 +1,6 @@
 import os
 import html
+from pathlib import Path
 from dotenv import load_dotenv
 from datetime import datetime, timedelta, timezone, UTC, date
 from secrets import token_urlsafe
@@ -27,6 +28,7 @@
 from ..utils.email_service import send_email
 from ..utils.audit_log import write_audit_log
 
+
 EMAIL_VALIDATION_ENABLED = True
 ALGORITHM = 'HS256'
 ACCESS_TOKEN_EXPIRE_MINUTES = 30
@@ -207,7 +209,7 @@ def _send_validation_email(user: UserAccount, token: str):
 
     validation_url = f"{BACKEND_URL}/validate-email?token={token}"
 
-    logo_url = f"{BACKEND_URL}/static/images/wellai-logo.png"
+    logo_path = Path(__file__).resolve().parent.parent / "static" / "images" / "wellai-logo.png"
 
     email_subject = "Verify your WellAI account"
 
@@ -236,7 +238,7 @@ def _send_validation_email(user: UserAccount, token: str):
                     border-bottom: 1px solid #eeeeee;
                 ">
                     <img
-                        src="{logo_url}"
+                        src="cid:wellai-logo"
                         alt="WellAI"
                         style="
                             max-width: 220px;
@@ -351,7 +353,9 @@ def _send_validation_email(user: UserAccount, token: str):
         recipient=user.Email,
         subject=email_subject,
         content=email_content,
-        content_type="html"
+        content_type="html",
+        inline_image_path=str(logo_path),
+        inline_image_cid="wellai-logo"
     )
 
 
diff --git a/server/utils/email_service.py b/server/utils/email_service.py
index 2b2319f..4db0f88 100644
--- a/server/utils/email_service.py
+++ b/server/utils/email_service.py
@@ -4,16 +4,20 @@
 from pathlib import Path
 from email.mime.multipart import MIMEMultipart
 from email.mime.text import MIMEText
+from email.mime.image import MIMEImage
 from dotenv import load_dotenv
 
 BASE_DIR = Path(__file__).resolve().parent.parent
 load_dotenv(BASE_DIR / ".env")
 
+
 def send_email(
     recipient: str,
     subject: str,
     content: str,
-    content_type: str = "plainText"
+    content_type: str = "plainText",
+    inline_image_path: str = None,
+    inline_image_cid: str = None
 ):
     """
     Sends an email using Brevo SMTP.
@@ -22,6 +26,8 @@ def send_email(
     :param subject: Email subject.
     :param content: Email body.
     :param content_type: 'plainText' or 'html'.
+    :param inline_image_path: Optional path to an image embedded in the email.
+    :param inline_image_cid: Optional Content-ID used by the HTML image src.
     :return: True if sent successfully, otherwise None.
     """
 
@@ -45,16 +51,55 @@ def send_email(
         if not sender_email:
             raise ValueError("SMTP_FROM_EMAIL is not configured")
 
-        message = MIMEMultipart("alternative")
+        # Use mixed when an inline image is attached.
+        if inline_image_path:
+            message = MIMEMultipart("mixed")
+
+            # Alternative part contains plain text / HTML versions.
+            alternative = MIMEMultipart("alternative")
+            message.attach(alternative)
+
+            if content_type.lower() == "html":
+                alternative.attach(MIMEText(content, "html"))
+            else:
+                alternative.attach(MIMEText(content, "plain"))
+
+            # Attach the image inline using Content-ID.
+            image_path = Path(inline_image_path)
+
+            if not image_path.exists():
+                raise FileNotFoundError(
+                    f"Inline image not found: {image_path}"
+                )
+
+            with open(image_path, "rb") as image_file:
+                image = MIMEImage(image_file.read())
+
+            image.add_header(
+                "Content-ID",
+                f"<{inline_image_cid}>"
+            )
+            image.add_header(
+                "Content-Disposition",
+                "inline",
+                filename=image_path.name
+            )
+
+            message.attach(image)
+
+        else:
+            # Keep the existing behavior for normal emails.
+            message = MIMEMultipart("alternative")
+
+            if content_type.lower() == "html":
+                message.attach(MIMEText(content, "html"))
+            else:
+                message.attach(MIMEText(content, "plain"))
+
         message["Subject"] = subject
         message["From"] = f"{sender_name} <{sender_email}>"
         message["To"] = recipient
 
-        if content_type.lower() == "html":
-            message.attach(MIMEText(content, "html"))
-        else:
-            message.attach(MIMEText(content, "plain"))
-
         print("===== BREVO EMAIL =====")
         print(f"Sending email to: {recipient}")
         print(f"Subject: {subject}")