diff --git a/sbc_compassion/models/correspondence_s2b_generator.py b/sbc_compassion/models/correspondence_s2b_generator.py
index 64e62c198..fc5664340 100644
--- a/sbc_compassion/models/correspondence_s2b_generator.py
+++ b/sbc_compassion/models/correspondence_s2b_generator.py
@@ -131,6 +131,26 @@ def onchange_month(self):
     def preview(self):
         """Generate a picture for preview."""
         pdf = self._get_pdf(self.sponsorship_ids[:1])[0]
+
+        # T2288 Force the maximum pages of a letter to be 15
+        pdf_list = self._get_pdf(self.sponsorship_ids[:1])
+        pdfPagesCount = (
+            pdf_list[0]
+            if pdf_list and isinstance(pdf_list[0], (bytes, bytearray))
+            else None
+        )
+
+        # Convert the byte string into a file-like object and initialize the PDF reader.
+        reader = PdfFileReader(BytesIO(pdfPagesCount))
+        # Count the number of pages in the PDF.
+        pageCount = len(reader.pages)
+
+        # Raise an error if the letter exceeds 15 pages, showing the actual number.
+        if pageCount > 15:
+            raise UserError(
+                _("This letter has %d pages. Please limit it to 15 pages.") % pageCount
+            )
+
         if self.template_id.layout == "CH-A-3S01-1":
             # Read page 2
             in_pdf = PdfFileReader(BytesIO(pdf))