If you are using the SMTP provider to send emails and they're not delivering most of the time, the reason is usually because the sender email doesn't match with the SMTP email that you've configured.
Once you set up your SMTP provider, if you are getting an error when you send a test email in the conversation, you can click the ⚠️(red triangle) icon to view more details about the error in the conversation.
For the error displayed in the conversation, the platform will fetch the error received from the SMTP provider and display it. If you are already sending from the SMTP-integrated email, please open a support ticket with the SMTP provider so they can provide the delivery status on the email.
Learn more about why you can't use a free email address as the SMTP.
Setting an alias for Google Workspace SMTP: Setting alias for Google SMTP
For SendGrid: SendGrid Documentation
For Zoho: Using Zoho as your SMTP provider
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