There have been similar issues in the past. See
Daily Mail not emailing where the file being sent was 69,920,427 bytes; yours is 69,920,427
The fix last time was to add in
Code:
compress_news_images = True
compress_news_images_max_size = 15
however
Code:
compress_news_images = True
is already in this recipe. Try adding in the other line
Code:
compress_news_images_max_size = 15