Not exactly. There is a mostr bridge (posts will show as mostr.pub) that allows mastodon instances to be seen on Nostr. If they don't block it.

https://youtu.be/bHzRCILEvY0?si=rFNBje4ITpmfqfy1

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oh that would be a shame if they blocked the bridge.. did tutanota set it up themselves tho i wonder? would they ever check the comments and interact w replies for example?

Pretty sure its just auto on. AFAIK it's two way communication and they should see your comments.

awesome