SMTP 550 Error: Requested action not taken: mailbox unavailable

SMTP 550 Error: Requested action not taken: mailbox unavailable

In some situations you attempt to send a mailing to a specific individuals/email addresses, however, you receive a Bounce message similar to the one below from their Mail server/client: 

Bounce Message: SMTP 550: Requested action not taken: mailbox unavailable

Answer:

This type of error code generally means that your SMTP Server is unable to deliver the communication to the intended recipient/s because his/her mailbox/address does not exist and is a hard bounce. 

    • Related Articles

    • Adding a Shared Mailbox to Outlook

      Before you can add a shared mailbox to Outlook, you must first confirm with the mailbox owner that you have been given sufficient privileges to do so. Once you have been granted access, follow the instructions below to add the mailbox to Outlook. ...

    • Can you List all Known SIP Responses?

      SIP responses are the codes used by Session Initiation Protocol for communication. We have put together a list of all the SIP responses known. 1xx = Informational SIP Responses 100 Trying – Extended search is being perform so a forking proxy must ...

    • Can you List all Known SIP Responses?

      SIP responses are the codes used by Session Initiation Protocol for communication. We have put together a list of all the SIP responses known. 1xx = Informational SIP Responses 100 Trying – Extended search is being perform so a forking proxy must ...

    • 3CX Transfer Directly to Voicemail

      Send an inbound call directly to a voicemail box if the destination extension is out-of-office or otherwise unavailable. 1. Answer the call. Determine that you need to transfer the call to voicemail. 2. Press “transfer” on your display or buttons. 3. ...

    • Disable SIP ALG on Hitron routers

      You can call your provider such as Rogers and request they "Disable SIP ALGs". They can do it remotely. OR Login into your router Open your browser such as Chrome or Firefox, and enter the address 192.168.1.1 When requested, enter your password. ...