Update tenant-allow-block-list-email-spoof-configure.md

Typo fix

Author: chrisda

defender-office-365/tenant-allow-block-list-email-spoof-configure.md

@@ -45,7 +45,7 @@ This article describes how admins can manage entries for email senders in the Mi
 
 - Entries for spoofed senders never expire.
 
-- For blocking inbound and outbound email from a domain, any subdomains in that domain, and any email addresses in that domain, create the block entry using the syntax: `*.TLD`, where `TLD` can be any top-level domain, interal domain, or email address domain.
+- For blocking inbound and outbound email from a domain, any subdomains in that domain, and any email addresses in that domain, create the block entry using the syntax: `*.TLD`, where `TLD` can be any top-level domain, internal domain, or email address domain.
 
 - For blocking inbound and outbound email from a sudomain in a domain and any email addresses in that subdomain, create the block entry using the syntax: `*.SD1.TLD`, `*.SD2.SD1.TLD`, `*.SD3.SD2.SD1.TLD`, etc. for internal domains and email address domains.