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554 5.7.520 Access denied, Your organization does not allow external forwarding. AS(7555)

08 Jul 2026 1 source

Zendesk

I’m setting up Zendesk using email forwarding from a Microsoft 365 shared mailbox. The mailbox receives email fine, but forwarding to Zendesk fails with: 554 5.7.520 Access denied, Your organization does not allow external forwarding. AS(7555) I’ve already: Enabled external forwarding in the outboun

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554 5.7.520 Access denied, Your organization does not allow external forwarding. AS(7555)

Reddit r/Zendesk 08 Jul 2026

I’m setting up Zendesk using email forwarding from a Microsoft 365 shared mailbox. The mailbox receives email fine, but forwarding to Zendesk fails with: 554 5.7.520 Access denied, Your organization does not allow external forwarding. AS(7555) I’ve already: Enabled external forwarding in the outboun