How do I stop Spamhaus blockage of sending emails using Thunderbird

Dsquared1
Grasshopper

In the past 5 years I have been blocked by Spamhaus from sending emails four times.  This is extremely frustrating as nothing amiss has ever been found.  It hasn't happened for at least 2 years, it seems to be random. 

What is that organization doing.  Every time I eventually get removed from their black list with no changes made to my system but it is a real nuisance.  

I have asked Shaw for help in the past but got zero help.

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