hi. is this still valid? https://blog.cloudflare.com/sending-email-from-workers-with-mailchannels Ge

hi. is this still valid?
https://blog.cloudflare.com/sending-email-from-workers-with-mailchannels
Getting:
{"errors":["Failed to send email: 550 5.7.1 This sender is not authorized to send from <mydomain>.com. See https://bit.ly/domain-lockdown. cfid=<myworker>-ca9.workers.dev"]}

Thanks
The Cloudflare Blog
MailChannels has created an email sending service specifically for Cloudflare Workers that removes all the friction associated with sending emails.
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