---
title: Bounce
description: "## **Common bounce errors** #### **550 sender has failed strict spf –** The sender/FROM domain fails strict SPF checking. The FROM domain does not pass spf. #### **550 This message was classified as rSPAM and may not be delivered –**…"
url: "https://www.mail.baby/tips/bounce/"
updated: "2021-03-16"
category: Other
---

# Bounce

## **Common bounce errors**

#### **550 sender has failed strict spf –**

The sender/FROM domain fails strict SPF checking. The FROM domain does not pass spf.

#### **550 This message was classified as rSPAM and may not be delivered –**

The message has been marked as spam and not delivered.

#### **550 This message has a blank subject –**

The message was sent with out a subject.

#### **550 err commondomain This message from domain does not pass SPF checks –**

The FROM domain is a common domain and does not pass SPF checks. Common causes are a FROM domain of a common mail provider like @gmail

#### **550 recipient domain does not resolve to any MX –**

The recipient domain does not resolve to any Mail server.