If your emails are suddenly going to spam, even the ones sent directly from Gmail, the issue isn’t random. Free @gmail.com addresses aren’t built for business communication, automations, or batch email sending. Since you don’t control the sending server, there’s almost nothing you can do to fix deliverability issues at the root level. The real solution is to move to a properly configured business email setup (such as Google Workspace), authenticate your domain correctly, and gradually warm up your sending volume while monitoring key deliverability metrics.

Email Deliverability

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