You can also use the Mailgun integration to send customized emails. The Core Sendmail action uses Rewst's internal mailgun integration, limiting you to our FROM account and settings, but if you configure your own, you will have more configuration available to you.

We just use an MS Graph call to send emails through a specifically-provisioned mailbox for emails that need to come from the company. We still use the standard Rewst one for quick and dirty internal messages.

Pretty similar to what has already been requested and something their PMs keep merging other customized branding into https://rewst.canny.io/features/p/customize-confirmation-emails