One of the most common reasons for phishing simulations or course emails not being delivered to end users is that usecure IPs and domains haven't been allow-listed in their email clients.
Allow-listing in Microsoft 365
If you use Microsoft 365, you will need to allow-list usecure IP addresses and configure Advanced Delivery to ensure phishing emails reach your end users.
Allow-listing in Google Workspace
If you use Google Workspace, you will need to allow-list usecure IP addresses and domains.
What are the usecure IP addresses?
198.21.6.191
168.245.56.242
What are the usecure domains?
usecure.io
user-training.com
amzwon.net
biiing.net
companylegal.co.uk
financialdept1.com
financialstaff.co.uk
firmlegal.co.uk
gdprlaw.co.uk
gohelpdesk.co.uk
gooolge.org
groupmailserver.co.uk
grouponedeals.com
hellpdesk.net
hhelpdesk.co.uk
humanres.co.uk
innermail.co.uk
it5upport.co.uk
ithelpdeskweb.co.uk
ithlpdesks.com
itsuppports.com
marketingcrew.co.uk
microloft.net
pessoleldept.com
sup0rt.co.uk
yahoooo.info
1nfoclient.fr
atencionalcleinte.com
banque-online.com
centre-assistance.fr
f1nancier.com
fiinancier.fr
financ1er.fr
hilfekunden.de
iinfoclient.fr
ithilfen.de
itsupp0rt.de
itsupportt.fr
kunden-unterstuzung.de
onlinbanking.de
pcsupport.fr
ressourceshumains.com
technischeuntersttzung.de
usbank.news
usbank.website
uspost.online
uspost.store
companypolicy.com.au
companyemail.com.au
singlesignon.com.au
gohelpdesk.com.au
gohelpdesk.co.nz
he1pdesk.co.nz
supp0rt.co.nz
supp0rt.co.za
supp0rt.ca
recusos-humanos.com
infoclientehoy.com
centro-asistencia.com
asistenciahoy.com
companypolicy.ie
gohelpdesk.ie
hhelpdesk.ie
humanres.ie
itsupports.ie
singlesignon.ie
suport.ie
sup0rt.ie
Note: Adding to an IP allow list is alternatively called white-listing or whitelisting.
Next steps
Find out how to allow list by IP address in Google Workspace
Find out how to allow list by IP address in Office 365