From 7cdfb626e0f7e6709afe555b7fecc967b6b782f3 Mon Sep 17 00:00:00 2001
From: Nikolay Matev <nikolay.matev@siteground.com>
Date: Tue, 17 May 2022 17:52:40 +0300
Subject: [PATCH] Fixed regex to properly handle email ids ending with '-by'

---
 mailparser/const.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mailparser/const.py b/mailparser/const.py
index 89efa3c..b8ea459 100644
--- a/mailparser/const.py
+++ b/mailparser/const.py
@@ -42,7 +42,7 @@
     # envelope-from and -sender seem to optionally have space and/or
     # ( before them other clauses must have whitespace before
     (
-        r'(?:by\s+(?P<by>.+?)(?:\s*[(]?envelope-from|\s*'
+        r'(?:[^-]by\s+(?P<by>.+?)(?:\s*[(]?envelope-from|\s*'
         r'[(]?envelope-sender|\s+from|\s+with'
         r'(?! cipher)|\s+id|\s+for|\s+via|;))'
     ),