Usually because the domain’s SPF, DKIM or DMARC records are missing or wrong. cPanel can check and repair them in one click.
- In cPanel, open Email → Email Deliverability.
- Look for domains marked with a problem. Click Repair for SPF and DKIM.
- If your domain’s DNS is managed elsewhere (not with Tremhost), cPanel shows the exact records to add. Copy them to your DNS provider.
- Add a DMARC record too. A safe start is
v=DMARC1; p=none; rua=mailto:[email protected], then tighten it once mail is flowing correctly.
Other common causes
- Sending the same message to many people at once from a normal mailbox. Use a mailing service for newsletters.
- A hacked mailbox or website sending spam, which damages the server’s reputation. Change passwords and tell us.
- Subject lines and content that look like spam: all capitals, lots of links, attachments from unknown senders.
For invoice fraud and phishing coming in, see Armor Mail.
Still stuck?
Open a support ticket with your domain name and what you see, or message us on WhatsApp. We answer Monday to Friday, 08:00–17:00 Central Africa Time.
Updated 5 November 2026. Something here out of date? Tell us.