The sender name plays a significant role in email deliverability to Hotmail/Outlook, though it's not always a primary spam filter criterion. Hotmail/Outlook considers sender reputation, and several factors related to the sender name can influence it. Inconsistencies between the sender name, sending domain, and email content can raise red flags. A recognizable, professional, and consistent sender name improves recipient trust, reduces spam complaints, and helps avoid spam filters. Technical aspects like non-alphabetic characters or unusual length, as well as generic names, can also negatively impact deliverability. Consistent sending practices that build sender reputation are crucial.