diff --git a/lib/parser.js b/lib/parser.js
index 52d4592..79606c2 100644
--- a/lib/parser.js
+++ b/lib/parser.js
@@ -113,7 +113,7 @@ var REGEXES = {
 
   recipient : [
     /the following addresses had permanent fatal errors (?:.*?)\s\<(.+?)\>/i,
-    /there was a temporary problem delivering your message to (.+?). Gmail will retry/i,
+    /there was a temporary problem (?:while )?delivering your message to (.+?). Gmail will retry/i,
     /the following message to \<(.+?)\> was undeliverable/i,
     /to the following addresses:\s*(.+)/i,
     /^your message wasn't delivered to (.+?)\s/mi, // "Your message wasn't delivered to john@acme.com"
@@ -555,6 +555,7 @@ class Parser {
     _str = _str.replace(this.__regexes.line_break_double_indent_single, "\n\n");
 
     // Replace single Line-break with regular space
+    // TODO: re2 doesn't support lookbehinds, so for now we use a pure-JS regex
     _str = _str.replace(/(?<!\n)\n(?!\n)/gm, " ");
 
     // Replace long indent with double Line-break
diff --git a/package.json b/package.json
index f3e77d7..632957e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "email-bounce-parser",
-  "version": "1.0.21",
+  "version": "1.0.22",
   "description": "Parses bounce emails and extract errors",
   "author": "Eliott Vincent <eliott@crisp.chat>",
   "main": "lib/index.js",