Emails arriving via an external connection where the email source address uses an internal domain, or internal subdomain, are blocked at the email gateway.
Topic
Blocking suspicious emails
Applicable to
all
History
Priority
Must
Sep 2022
Emails arriving via an external connection where the email source address uses an internal domain, or internal subdomain, are blocked at the email gateway.
xisting controls covering ‘domains’ were amended to ‘domains (including subdomains)’ to avoid confusion as to whether subdomains were in scope or out of scope for these controls.
Mar 2019
Emails arriving via an external connection where the source address uses an internal domain name are blocked at the email gateway.
Security control 1502 was reworded.
Feb 2019
All emails arriving via an external connection where the source address uses an internal domain name are blocked at the gateway.
Nov 2018
All emails arriving via an external connection where the source address uses an internal domain name are blocked at the gateway.
Added as a result of a split of security control 0561.