https://kb.wisc.edu/wiscel/feedback.php?action=2&help=suggest&id=51595
Feedback: Microsoft 365 - Custom Email Addresses in the @wisc.edu Domain
custom email addressesin thefeedbackmicrosoft
https://support.squarespace.com/hc/en-us/articles/205812268-Custom-email-addresses-and-Squarespace
Custom email addresses and Squarespace – Squarespace Help Center
Set up and send emails using a custom email address that matches your domain. If you have a custom domain linked to your Squarespace...
custom email addressessquarespacehelpcenter
https://support.atlassian.com/organization-administration/docs/add-custom-email-addresses-for-product-notifications/
Add custom email addresses for app notifications | Atlassian Support
Configure email addresses so that emails from Jira and Confluence appear like they’re coming directly from your company domain, complying with DMARC.
custom email addressesapp notificationsatlassiansupport