Hello,
I have an issue where whenever I (or Blesta auttomation) want to send an E-Mail through the Blesta panel, I get an error saying:
The email failed to send due to a configuration issue.
When I looked into the logs, I found out, that it didn't send because of this error:
Expected response code 354 but got code "554", with message "554 5.5.1 Error: no valid recipients "
This error is unexpected, because the recipient addresses are indeed valid. They belong to test accounts and they are not receiving any of the mail.
I'm sending E-Mails through an unencrypted SMTP connection, and when I test the configurattion, it can connect.
I'm running Blesta 5.5.3