From 6ef8a9a391a3ae7657825da49e12562167011024 Mon Sep 17 00:00:00 2001
From: Andreas Pries <6615476+MiDniGG@users.noreply.github.com>
Date: Tue, 29 Sep 2026 22:48:07 +0200
Subject: [PATCH] Fix duplicate contacts on autosave for addresses with
 uppercase letters

IncFrec() lowercases the existing addresses but compares them against the
new address in its original case, so an address with uppercase letters is
never found and a new contact is created on every send.

Fixes #1767
---
 .../libraries/RainLoop/Providers/AddressBook/PdoAddressBook.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/snappymail/v/0.0.0/app/libraries/RainLoop/Providers/AddressBook/PdoAddressBook.php b/snappymail/v/0.0.0/app/libraries/RainLoop/Providers/AddressBook/PdoAddressBook.php
index 155ea781d..d76fbfc02 100644
--- a/snappymail/v/0.0.0/app/libraries/RainLoop/Providers/AddressBook/PdoAddressBook.php
+++ b/snappymail/v/0.0.0/app/libraries/RainLoop/Providers/AddressBook/PdoAddressBook.php
@@ -997,7 +997,7 @@ class PdoAddressBook
 					$sEmail = \trim($oItem->GetEmail(true));
 					if (\strlen($sEmail)) {
 						$aEmailsToUpdate[] = $sEmail;
-						return !\in_array($sEmail, $aExists);
+						return !\in_array(\mb_strtolower($sEmail), $aExists);
 					}
 				}
 				return false;