Test emails are sent, but when i try to send from contact's page i get an error

Your software
My Mautic version is: 4.1.2
My PHP version is: 7.4.27
My Database type and version is:

Version 10.3.31-MariaDB-0+deb10u1
Doctrine driver pdo_mysql
Doctrine database platform (automatically detected) Doctrine\DBAL\Platforms\MariaDb1027Platform

Your problem
My problem is:

I configured my Email SMTP (I’m suing Kirim’s transactional SMTP relay) and succesfully send and receive the test email.

Then i created a contact and tried to send an email from the contact’s page and i get an error.

These errors are showing in the log:
Failed to send to ds@myemaildomain.co: Expected response code 250 but got code “550”, with message "550 Message denied "

Steps I have tried to fix the problem:

Reviewed the Email settings, tried TLS 587 (connection and email tests are successful) and SSL 465 (connection and email tests are successful) both fail after i try to send from contact’s page with the same error.

I’m a 100% newbie, this is my first go at Mautic, so all the help is highly appreciated!


Message denied means your email left your smtp but the recipient doesn’t want to recieve it.