lock inside read, ignore unreadable files

test/minimail.py

@@ -53,12 +53,15 @@ def newer(file1, file2=None):
 
 
 def recv_all(inbox, marker):
-    with Lock(inbox):
     r = []
     while not r:
         for f in compress(inbox.glob("*.eml"), partial(newer, file2=marker)):
+            with Lock(inbox):
+                try:
                     t = f.readall()
                     r.append(t)
+                except:
+                    pass
         if not r:
             sleep(1)
     marker.touch(exist_ok=True)