Mail Assure Troubleshooting
Outbound message failure: Mimecast Error: 550 Administrative prohibition - envelope blocked
Last Modified
Thu Dec 08 13:20 GMT 2022
Description
- Outbound emails are being rejected by the recipient with a error
5.0.0 smtp; 550 Administrative prohibition - envelope blocked
- Rejection message shows "
Remote Server returned '<us-smtp-inbound-1.mimecast.com #5.0.0 smtp; 550 Administrative prohibition - envelope blocked -
https://community.mimecast.com/docs/DOC-1369#550
>'
"
Environment
- Mail Assure
Solution
- There are two reasons for this issue:
- The sender's email address or domain has triggered a Blocked Senders Policy on the Recipient's main server
- Contact the recipient via another method and ensure that the sending domain or address does not feature on a sender Block list
- If present, have the recipient remove the sending domain or address from the Block list
- Contact the recipient via another method and ensure that the sending domain or address does not feature on a sender Block list
- There is a SPF hard rejection on the sending servers SPF record
- Confirm the SPF record is correct to allow mail to be sent through Mail Assure
- Full details can be found here: Set up SPF
- The sender's email address or domain has triggered a Blocked Senders Policy on the Recipient's main server