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I am trying to set up auto-forwarding for emails to a Teams chat using rules, but keep receiving an error that says "Your message wasn't delivered because the recipient's email provider rejected it." While I can manually forward/send emails to the Teams chat with no issue, I am unable to configure the rules for auto-forwarding. Does anyone have any suggestions or advice for this problem?
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For better research, please provide more information about this case:
How did you create this auto-forward rule?
Are you forwarding to Teams personal chats or in a channel?
I used the Rules setting which is located in the Settings Menu So every time I received an email from a certain address, it would forward it to another email which was connected to a teams channel.
Hi
Does a message that satisfies the rule have to forward many emails at once?
Are all emails not forwarded successfully?
Based on the error message, this may be caused by an outbound spam filtering policy in Office 365 that prevents messages from being automatically forwarded to external domains by default. Try contacting your administrator to enable the auto-forwarding setting to check if there are any discrepancies.
In the Microsoft 365 Defender portal at https://security.microsoft.com, go to Email & Collaboration > Policies & Rules > Threat policies > Anti-spam in the Policies section.
Also, please check if the answers provided by Andy David are helpful.
Hi
Haven't received your message for a long time.
Do you have any further issue on this topic?
Sounds like its failing because of DMARC and auto-forwarding.
Auto-forwarding breaks SPF and sometimes DMARC typically - and are these are being auto-forwarded from an external sender to the teams chat?
If the original sender is using DKIM, that can help