Patch 471400: escape single-dot lines; by Jason Hildebrand.

RFC 2049 recommends never outputting a line consisting of a single
dot.

Lib/quopri.py

@@ -61,6 +61,8 @@ def write(s, output=output, lineEnd='\n'):
         # that trailing character encoded.
         if s and s[-1:] in ' \t':
             output.write(s[:-1] + quote(s[-1]) + lineEnd)
+        elif s == '.':
+            output.write(quote(s) + lineEnd)
         else:
             output.write(s + lineEnd)
 

Misc/ACKS

@@ -180,6 +180,7 @@ Gary Herron
 Bernhard Herzog
 Magnus L. Hetland
 Kevan Heydon
+Jason Hildebrand
 Konrad Hinsen
 David Hobley
 Tim Hochberg