Thunderbird settings

[wendyl]

A couple of niggly things on my hubby's PC would like to resolve.
When opening any email I get a sender verification message "could not get SPF info DNS server refused TCP connection"
When opening email the full message source is displayed and then printed when I wish to print just the message - this is particularly annoying and I can't find a setting which remedied this. This was originally my PC and has been ongoing for some time and uses XP
Please can anyone direct me to alter necessary settings or advise or should I re install thunderbird? If so should I delete first. I do not have these problems on my PC running Vista and newer
Any help much appreciated