1 files changed, 8 insertions, 6 deletions
diff --git a/mailnews/imap/src/nsImapServerResponseParser.cpp b/mailnews/imap/src/nsImapServerResponseParser.cpp
index fb51db217..d37231ab9 100644
--- a/mailnews/imap/src/nsImapServerResponseParser.cpp
+++ b/mailnews/imap/src/nsImapServerResponseParser.cpp
@@ -3143,11 +3143,13 @@ bool nsImapServerResponseParser::msg_fetch_literal(bool chunk, int32_t origin)
         if (fTotalDownloadSize > 0)
           fServerConnection.PercentProgressUpdateEvent(0, charsReadSoFar + origin, fTotalDownloadSize);
       }
-      if (charsReadSoFar > numberOfCharsInThisChunk)
+      if (!lastChunk && (charsReadSoFar > numberOfCharsInThisChunk))
       {
-        // This is the last line of a chunk. "Literal" here means actual email data and
-        // its EOLs, without imap protocol elements and their EOLs. End of line is
-        // defined by two characters \r\n (i.e., CRLF, 0xd,0xa) specified by RFC822.
+        // This is the last line of a chunk but not the last chunk of a multi-chunk
+        // message or the only "chunk" of a smaller non-chunked message. "Literal" here
+        // means actual email data and its EOLs, without imap protocol elements and their
+        // EOLs. End of line is defined by two characters \r\n (i.e., CRLF, 0xd,0xa)
+        // specified by RFC822.
         // Here is an example the most typical last good line of a chunk:
         // "1s8AA5i4AAvF4QAG6+sAAD0bAPsAAAAA1OAAC)\r\n", where ")\r\n" are non-literals.
         // This an example of the last "good" line of a chunk that terminates with \r\n
@@ -3217,7 +3219,7 @@ bool nsImapServerResponseParser::msg_fetch_literal(bool chunk, int32_t origin)
       }
       else
       {
-        // Not the last line of a chunk.
+        // Not the last line of a chunk or any line when lastChunk.
         if (!fNextChunkStartsWithNewline)
         {
           // Process unmodified fCurrentLine string.
@@ -3229,7 +3231,7 @@ bool nsImapServerResponseParser::msg_fetch_literal(bool chunk, int32_t origin)
         {
           // Ignore the orphan '\n' on a line by itself.
           MOZ_ASSERT(strlen(fCurrentLine) == 1 && fCurrentLine[0] == '\n',
-                     "Expect '\n' as only character in this line");
+                     "Expect '\\n' as only character in this line");
           fNextChunkStartsWithNewline = false;
         }
       }