# Bug OP-18134 - Meeting invitation decline in Gmail results in deliverability error mails

Project: OpenProject
Status: closed
URL: https://community.openproject.org/work_packages/OP-18134

## Open points

_No work packages_

## Details

| Attribute | Value |
| --- | --- |
| Date |  |
| Priority | Medium |
| Module | Modules and project features / Meetings |
| Target versions | 16.6.0 |
| Observed in versions | 16.5.0 |
| Sprint | 16.6.0 |
| Backlog bucket |  |
| Bug found in version (deprecated) | 16.5.x |
| Found in mobile app version |  |
| Follow-up feedback e-mail |  |
| Requires doc change | No |
| Accessibility | No |
| Pull preview |  |
| List |  |
| Labels |  |

## People

| Attribute | Value |
| --- | --- |
| Assignee |  |
| Accountable |  |
| Product manager |  |
| Developers | Oliver Günther |
| Designer |  |
| Ordered by |  |
| Signed off by |  |
| Interest by |  |

## Planning

| Attribute | Value |
| --- | --- |
| Relevance |  |

## Costs

| Attribute | Value |
| --- | --- |
| Votes |  |
| Work |  |
| Labor costs |  |

## Description

### Steps to reproduce

_Please write down the steps to reproduce. Try to write down all necessary preconditions (what permissions do you have, are other users involved?). Example:_

1.  Create a meeting in meeting module and invite a User with a Gmail adress.
    
2.  Log into that Gmail Account and Decline the Invitation to that meeting. (make sure gmail sends answer mail)
    

### What is the buggy behaviour?

*   E-Mail comes back stating:
    
    Address not found, message to **notifications@openproject.com** not delivered,
    
    550 5.1.1 : Recipient address rejected: User unknown in relay recipient table
    
*   **NOTE:** A customer even received this message up to six times in a row
    

### What is the expected behaviour?

_Describe how the application should behave like. Example:_

1.  Decline should be processed without sending this message.
    

###   

### Screenshots and other files

_<img class="image_resized op-uc-image op-uc-image_inline" style="width:499px;" src="/api/v3/attachments/804422/content">_

### Environment information

_Please check and fill out the following details to help us identify in what versions and distributions of OpenProject the error occurs_

**OpenProject installation type**

*   Hosted cloud edition
    
*   Packaged installation
    
*   Docker All-in-one container
    
*   Docker-compose installation
    
    <br>
    

**OpenProject version**

_16.5.x_