We won't go into the process of setting up and sending your Broadcast Emails here — you can see details on that process here.
What we will look at here are two common errors you may see when attempting to send Broadcast Emails via Redtail CRM if you have 1) not entered your email server settings within the CRM or 2) not entered these correctly.
In the first instance, after selecting your contacts to email and then choosing Broadcast Email from the Options menu, you might see this message:
You'll need to head over to Manage Your Account —> Change Site Preferences to the Email Options area:
Instructions for completing the SMTP settings required to send Broadcast Emails can be found in this post, in the Required SMTP Settings section.
After entering these settings and saving, you can then head back to your Broadcast Email and, if you've entered the settings correctly, you shouldn't encounter any further problems.
If something about your settings has been entered incorrectly, however, you will receive another error message log, with details as to the SMTP Server Setting connection errors. If you are unable to determine why you are receiving the error, you can contact your email hosting company to gather your correct settings and reenter them.