So, are they actual extra spaces (e.g. 2 spaces between words) or is it justified in a way that creates more space between words? And did you examine the html of the epub or of the azw3 file? In the epub, what kind of html tags are around the IM parts? Are there any attributes in the style sheet that are different than the other paragraphs? Is it possible for you to post a snapshot of a bit of the html of IM conversation?
Also, did you make any changes to the Look & Feel section of the conversion page of Calibre?
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