Comment by dewey

You can create an email address for a specific Slack channel in Slack directly (https://slack.com/help/articles/206819278-Send-emails-to-Sla...), then it's just a matter of setting up a GMail filter to forward these mails to that address.

Not sure digging up your Slack, Google, Apple API keys is faster...and probably also more of a hassle for compliance than just using Slack and Email which are already there.