Frequently when I receive an email that includes previous emails I have sent e.g. the received email contains my original email, the original email has extra line spacing that were not there when first written. Each time an email is include with a new one the number of blank line spaces increases. This appears to happen at each point where the original line of text was completed with a (carriage) return. Sometimes the emails grow so large that they become difficult to read.
I can delete the extra blank lines but they usually return went the previously sent email is next sent or received. I have had this issue for quite a while but usually the number of times an email is bounced back and forth is relatively low.
I read somewhere that this issue might have something to do with an incompatibility between emails sent in html but received and viewed as text only, and visa-versa.
I am using Firefox 27.0.1 with GMX web based email account and Thunderbird 24.3.0 to backup the emails. The problem existed with other versions of Firefox and I have only recently been backing up my emails to Thunderbird. Because my English grammar and spelling is quite bad, I frequently write the emails using MS Word 2003 ->Spell/Grammar Check-> then copy and paste into the GMX webpage.
Any help or suggestions would be very much appreciated.