mailutils: support invalid senders

1: D400 First line should end with '.', not 'n'
1: D205 Blank line missing between one-line summary and description
4: I102 copyright year is outdated, expected 2014 but got 2012
46:6: E126 continuation line over-indented for hanging indent
59:10: E126 continuation line over-indented for hanging indent
73: D400 First line should end with '.', not 'd'
73: D205 Blank line missing between one-line summary and description
86:25: E124 closing bracket does not match visual indentation
126:8: E714 test for object identity should be 'is not'
128:8: E714 test for object identity should be 'is not'
144: D301 Use r""" if any backslashes in a docstring
144: D202 No blank lines allowed *after* function docstring, found 1
144: D400 First line should end with '.', not 'y'
144: D205 Blank line missing between one-line summary and description
194:70: W291 trailing whitespace
195:71: W291 trailing whitespace
291:38: F841 local variable 'exc' is assigned to but never used
297: D209 Put multi-line docstring closing quotes on separate line
297: D400 First line should end with '.', not 'l'
297: D205 Blank line missing between one-line summary and description
306:13: E126 continuation line over-indented for hanging indent
311: D209 Put multi-line docstring closing quotes on separate line
311: D400 First line should end with '.', not 'l'
311: D205 Blank line missing between one-line summary and description
320:13: E126 continuation line over-indented for hanging indent
325: D209 Put multi-line docstring closing quotes on separate line
325: D400 First line should end with '.', not 'l'
325: D205 Blank line missing between one-line summary and description
337:13: E126 continuation line over-indented for hanging indent
346: D209 Put multi-line docstring closing quotes on separate line
346: D400 First line should end with '.', not 'l'
346: D205 Blank line missing between one-line summary and description
358:13: E126 continuation line over-indented for hanging indent
367: D209 Put multi-line docstring closing quotes on separate line
367: D205 Blank line missing between one-line summary and description
518:1: E302 expected 2 blank lines, found 0
518: D401 First line should be imperative: 'Remove', not 'Removes'
518: D202 No blank lines allowed *after* function docstring, found 1
518: D400 First line should end with '.', not 'n'
518: D205 Blank line missing between one-line summary and description
537:1: E302 expected 2 blank lines, found 1
537: D400 First line should end with '.', not 's'
537: D205 Blank line missing between one-line summary and description