[Mailman-Developers] PortableUnixMailbox versus UnixMailbox as superclass for Mailman's Mailbox class

[Richard Barrett]

Hello experts

In MM 2.1.3, the Mailbox class defined in Mailman.Mailbox uses the 
standard Python class mailbox.PortableUnixMailbox as its superclass.

This has caused me some grief with an unescaped 'From ...' line 
following a blank line in an mbox archive. The use of 
PortableUnixMailbox leads to a false splitting of this message when the 
mbox is being read by the next() function, with consequent failure in 
processing of the second, false, message.

Having the  mailbox.UnixMailbox class as the superclass of the Mailman 
Mailbox class prevents this problem.

Can anyone tell me why MM's 2.1.3 code currently uses 
PortableUnixMailbox instead of UnixMailbox and what the downside is of 
my continuing to run my system with the modification to use UnixMailbox.

Thanks in advance

Richard
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Richard Barrett                               http://www.openinfo.co.uk