found the bremen_calling_logo.png file within the client's resources. Mapping towards that file when creating email notifications. This alleviates an additional dependency.

src/server/BreCal/services/email_handling.py

@@ -237,13 +237,20 @@ import typing
 from email.mime.application import MIMEApplication
 import mimetypes
 
-def add_bremen_calling_logo(msg_multipart, path):
+def add_bremen_calling_logo(msg_multipart):
     """
     The image is not attached automatically when it is embedded to the content. To circumvent this,
     one commonly creates attachments, which are referred to in the email content.
 
     The content body refers to 'LogoBremenCalling', which the 'Content-ID' of the logo is assigned as.
     """
+    # find the path towards the logo file (located at 'brecal\src\BreCalClient\Resources\logo_bremen_calling.png')
+    src_root_folder = os.path.dirname(os.path.dirname(os.path.dirname(os.path.dirname(__file__))))
+    resource_root_folder = os.path.join(src_root_folder, "BreCalClient", "Resources")
+
+    path = os.path.join(resource_root_folder, "logo_bremen_calling.png")
+    assert os.path.exists(path), f"cannot find logo of bremen calling at path: {os.path.abspath(path)}"
+
     with open(path, 'rb') as file:
         attachment = MIMEApplication(file.read(), _subtype=mimetypes.MimeTypes().guess_type(path), Name="bremen_calling.png")
 
@@ -283,7 +290,7 @@ def create_shipcall_evaluation_notification(email_handler, ship_name:str, evalua
             email_handler.attach_file(path, msg=msg_multipart)
 
     # add the bremen calling logo, which is referred to in the email body
-    msg_multipart = add_bremen_calling_logo(msg_multipart, path=os.path.join("C:/Users/User/brecal/misc/logo_bremen_calling.png"))
+    msg_multipart = add_bremen_calling_logo(msg_multipart)
     return (msg_multipart,content)
 
 def send_notification(email_handler, email_tgts, msg, pwd, debug=False):