Email address check is case sensitive

[abij]

I cannot upload to Wordpress because the user is found, but not matching email.
I tried various combinations, the error does not show the possible options. (found user emails)

wordpress-markdown-blog-loader/src/wordpress_markdown_blog_loader/api.py

Line 341 in a34b6b9

user = next(filter(lambda u: email and u.email == email, users), None)