550 5.7.1 service unavailable, client host blocked using spamhaus.
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550 5.7.1 service unavailable, client host blocked using spamhaus.

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Article ID: 377440

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Updated On:

Products

Messaging Gateway

Issue/Introduction

Outboud messages cannot be delivered due to the following SMTP error "550 5.7.1 service unavailable, client host blocked using spamhaus."

Resolution

Customers need to create a request to Spamhaus to get know the reason behind this. The issue can happen when the EHLO SMTP command shows different domain or hostname.