The “outlook_invalid_sender” error occurs when Mailmeteor attempts to send an email using a configured sender address, but Outlook refuses the request. This guide will help you understand the factors leading to this issue and how to resolve them.

What causes the Outlook invalid sender error?

Here are common errors that might cause this outlook_invalid_sender error:

• The sender email address used in Mailmeteor may not be properly configured in your Outlook account. Ensure that the email address you wish to send from is correctly set up in your Outlook settings.

• You may not have the necessary permissions to send emails from the specified email address. Check your Outlook account settings to confirm that you can send emails from that address.

• If you are using an unsupported account type or if the email address is not allowed to send emails from Mailmeteor, you may encounter this error.

Steps to resolve the issue

First, you should confirm that you can send emails from the sender’s email address:

1. Sign in to Outlook.
2. Compose an email and select the sender’s email address in the “From:” field.
3. Send the email to different email addresses.

If you don’t receive the email, the problem is likely with the Outlook setup rather than Mailmeteor. You should check again how to configure different senders or contact your IT admin or the email owner to grant you this permission.

Once you successfully receive the email:

1. Sign in to Mailmeteor Dashboard.
2. Make sure it’s the same address that you have added in Mailmeteor.

You can follow our alias tutorial to ensure it’s correctly configured. If you’ve confirmed that the settings are correct but you still face issues, reach out to Mailmeteor support with your account details and the specific error message for further assistance.