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Hi
Our development team has reviewed the details, and it appears the issue originates from the forwarding email address' provider (Microsoft O365) and needs to be addressed there.
Bounce Message:
550 5.7.520 Access denied, Your organization does not allow external forwarding. Please contact your administrator for further assistance.
This issue is due to a Microsoft O365 security update that disabled email forwarding to external accounts. To fix this, you’ll need to implement an anti-spam policy that allows external forwarding.
Resolution Steps:
If you need further details, please reach out to your email provider. Let us know if we can assist in any way!
Regards,
Shivani | Zoho Desk
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