Question 56467 in cPanel Question posted in
The official documentation can be seen here.

Expected response code 250 but got code "550", with message "550-Requested action not taken: mailbox unavailable 550 Sender address has null MX – CPanel

P.S. I am doing all of this testing on my local machine.I have tested my smtp settings with this online website https://www.smtper.net/. Each one of below services are sending the emails.

I am trying to setup email confirmation system for my Laravel application and keep on getting this error with email created through cpanel.

I have tried using Gmail/mailtrap/mailosaur for testing with these settings and everything was working fine:

MAIL_MAILER=smtp
MAIL_HOST=smtp.gmail.com
MAIL_PORT=587
[email protected]
MAIL_PASSWORD='password'
MAIL_ENCRYPTION=tls
[email protected]
MAIL_FROM_NAME="${APP_NAME}"

MAIL_MAILER=smtp
MAIL_HOST=smtp.mailtrap.io
MAIL_PORT=2525
MAIL_USERNAME=ab723b95067210
MAIL_PASSWORD=password
MAIL_ENCRYPTION=tls

MAIL_MAILER=smtp
MAIL_HOST=mailosaur.net
MAIL_PORT=2525
[email protected]
MAIL_PASSWORD=password
MAIL_ENCRYPTION=tls
MAIL_FROM_NAME="${APP_NAME}"

but now when I am using my custom email i am getting this error in my logs file:

[2021-12-26 09:17:53] local.ERROR: Expected response code 250 but got code "550", with message "550-Requested action not taken: mailbox unavailable
550 Sender address has null MX
" {"exception":"[object] (Swift_TransportException(code: 550): Expected response code 250 but got code "550", with message "550-Requested action not taken: mailbox unavailable
550 Sender address has null MX

MAIL_MAILER=smtp
MAIL_HOST=smtp.ionos.com
MAIL_PORT=587
[email protected]
MAIL_PASSWORD='password'
MAIL_ENCRYPTION=tls
[email protected]
MAIL_FROM_NAME="${APP_NAME}"
Tags:

3

Answers


  1. 0

    This configuration is working well on my environment. Please try like this.

    MAIL_MAILER=smtp
MAIL_HOST=smtp.mailtrap.io
MAIL_PORT=2525
MAIL_USERNAME=<your_username_goes_here>
MAIL_PASSWORD=<your_password_goes_here>
MAIL_ENCRYPTION=tls
MAIL_FROM_ADDRESS=<your_email_goes_here>
MAIL_FROM_NAME="${APP_NAME}"`
    Login or Signup to reply.
  2. 0

    "mailbox unavailable 550 Sender address has null MX".

    It seems your smtp server can’t find the IP address of the receiving mail server.
    Are you sending to a valid email address?
    Have you set up a DNS MX record?

    Login or Signup to reply.
  3. 0

    Make sure that the sender email is valid. By that I mean if the provider of your sender email exist.

    Example of invalide email: [email protected]

    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search