Hello Laura,
Good day!
Thank you for sharing your knowledge to the community. We really appreciate your information.
In addition to Julius Cesar_B and to your post, please be informed that Microsoft will always notify the sender of the email once our server detects that you're trying to send an email to a non-existing account. Meaning to say, if the email
address is misspelled or not, Microsoft will automatically detect if the address is indeed available or not.
For example:
You're trying to send an email to this address (abc@hotmail.com) and you've accidentally mistyped it as acb@hotmail.com,
abc@hotmail.co or abc@hotmail.org
as long as these addresses are already taken or someone uses/registered it, your email will still go through and you will not receive a failure delivery notification.
Should you have other questions or any other concerns, please reply to this thread and we will be happy to further assist you.