Patch by Zarafa <http://www.zarafa.com/> - this patch makes sure that vmime does not parse trailing spaces
on an header. Otherwise vmime will throw an exception and a fallback delivery will be started. It includes
a patch when then last header does not end with \n; fixes read receipt e-mails.

--- libvmime-0.7.1/src/headerField.cpp					2005-03-18 22:26:47.000000000 +0100
+++ libvmime-0.7.1/src/headerField.cpp.strip-header-endspaces-and-end	2010-02-15 21:38:37.000000000 +0100
@@ -190,6 +190,19 @@
 					}
 				}
 
+				if (pos == end && contentsEnd == 0) {
+					// end of data, and an enter was not found at the end
+					contentsEnd = end;
+				} else {
+					// strip spaces from end of header lines, also through continuation headers
+					contentsEnd--;  // original enter
+					while (contentsEnd>contentsStart &&
+						   (buffer[contentsEnd] == ' ' || buffer[contentsEnd] == '\t' ||
+							buffer[contentsEnd] == '\r' || buffer[contentsEnd] == '\n'))
+						contentsEnd--;
+					contentsEnd++;  // new 'enter'
+				}
+
 				// Return a new field
 				headerField* field = headerFieldFactory::getInstance()->create(name);