email header wrapping and truncation

Greetings all,

This is a problem that has bitten me in the past, but I finally tracked  
it down, with sufficient examples to demonstrate the problem.

In most cases, email headers (in the actual message) are

Header:  content

However, for some long values, it appears as

Header:
  content

If the content is long enough, you get

Header:
  first part of header, but tr
          uncated and wrapped.

It seems that in this last case, Balsa only sees the first line as the  
value of that header ("first part of header, but tr") which can cause a  
problem, if, for example, it is the "Reply-to:" header.  I now have two  
examples of this actually happening.  One is marketing messages I used  
to get from consumer cellular.  The other is from the gentoo.org  
mailing list system.  If I send a subscribe reqeust, it replies with a  
message I need to reply to to confirm the request.  However, it's  
Reply-to is of the third form above, and not noticing the truncation,  
my first reply just got me an error bounce.

Most interesting however, is that when I went to find the comsumer  
cellular example, I found a fourth type:

Header: Initial part o
  f header, with more here, and th
          e remainder here

In this case, Balsa gets the entire content of the header without  
problem.

I suppose the difference between the third and fourth types depends on  
one of the mail handlers between the sender and the one I get the  
message from by POP3.  However, I don't know if consumer cellular  
changed their system, or something changed someplace else in between,  
or perhaps some change in Balse (or a library) as all examples I can  
find of the third type are older than the fourth type.

Sorry for rambling, but hopefully this explains my issue enough for  
someone to either confirm it or point out what I'm doing wrong.

Let me know if you need any other info, such as versions of libraries  
my Balsa is compiled against.

Thanks for any help.

Jack