Yes there were and issue has been closed but the problem is still.
https://github.com/Foundry376/Mailspring/issues/399
Mac OS X
Version 1.2.1 (1.2.1)
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Bug?
No
No
Yes , The sample images are showing that if you write an email in right to left format, it will be sent in left to right mode no matter what. even in my inbox is in left to right mode.

and the result is :

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Feature Request?
all the email clients has this feature!
Hey! Thank you for filing this - sorry the earlier issue got closed. I'll see if I can reproduce this and get it fixed in the next build. It definitely seems like something that should be addressed ASAP.
Thanks for your response , to be honest (if it helps) we tried to work on the composer component but it seems that the composer is making it rtl correctly but the problem is something after sending the mail and in the cloud. we could not find it by reading the source of composer.
Thanks again for reporting this鈥攊t looks like a change in Slate required us to manually add the dir=rtl tag when translating the body of the message to HTML. I've fixed it and this will ship in the next release.
Thanks, I'm waiting for it. after testing I will update the issue and close it.
Hey! This has shipped in 1.2.2 - the app should auto-update in the next few hours, or you can download the new version directly from getmailspring.com. Thanks again for reporting this鈥擨'm not sure how I missed this in the first round of testing.
I'm thankful for your dedication and believe me I tested so many applications for mac but mailspring is by far the best! keep up the good work! I will continue to test and if I can I would contribute to the source.