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 here:
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
Learn more about Why Can't I use My Free Email Address As The SMTP?
Setting alias For Google Gsuite SMTP:
https://help.gohighlevel.com/support/solutions/articles/48001184605-setting-alias-for-google-smtp
For SendGrid:
https://docs.sendgrid.com/ui/sending-email/senders
For Zoho:
https://help.gohighlevel.com/support/solutions/articles/48001173743-using-zoho-as-your-smtp-provider
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