Outlook Not Sending Emails To Certain Contacts

There could be several reasons why Outlook is not sending emails to certain contacts. The first thing to check is whether the emails are being blocked by an administrator or if the contact’s email address is incorrect or outdated. It’s also possible that the contact’s email server may be rejecting the message due to spam filters or other issues. Additionally, if the message is too large, the contact’s server may be rejecting it. Lastly, it’s possible that the contact’s mailbox may be full, so any new messages are not being accepted.