You send an important quote, two days go by, and the client says they never received it. You check the sent folder, confirm the address and everything looks fine. Then someone suggests checking the junk folder. There it is.
Having your emails go to spam is more common than many companies realise, and the reason is not always the message itself. A poorly configured domain, a weak sender reputation or certain sending habits can cause a business email to end up somewhere nobody will see it.
For a company, this is more than a minor inconvenience. It can mean ignored quotes, unread invoices, customers who think you never replied and commercial opportunities that disappear without anyone knowing why.
Why do your emails go to spam?
Email providers analyse many signals before deciding whether a message belongs in the inbox. There is no single cause, but some problems appear again and again.
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Your domain is not properly authenticated
If records such as SPF, DKIM or DMARC are missing, the receiving server may struggle to verify that the message genuinely comes from your company.
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Your sender reputation is poor
Bulk sending, frequent bounces or spam complaints can make your domain look less trustworthy.
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The content looks suspicious
Too many capital letters, questionable links, unusual attachments or overly promotional language can trigger spam filters.
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Your email server is misconfigured
An outdated system or incorrect technical setup can also reduce the reliability of your corporate email.
SPF, DKIM and DMARC without the jargon
These three names may sound technical, but their purpose is simple: they help prove that the messages sent from your domain are legitimate.
SPF defines which servers are allowed to send emails on behalf of your company. DKIM adds a digital signature so the recipient can verify that the message has not been altered. DMARC tells the receiving provider what to do when those checks fail.
When these records are missing or incorrectly configured, the recipient has fewer reasons to trust the message. As a result, your emails go to spam, are rejected completely or display warnings about an unverified sender.
Your domain reputation matters too
Every domain builds a kind of track record. If it sends too many messages that bounce, launches campaigns to people who never asked for them or receives repeated spam complaints, its reputation can deteriorate.
It is also worth checking whether the domain or sending IP appears on a blacklist. This can happen after a compromised account, an unauthorised email campaign or a poor corporate email configuration.
Restoring a damaged reputation can take time. Prevention is therefore the better approach: protect accounts, monitor outgoing messages and act quickly when suspicious activity appears.
The message itself can trigger spam filters
Even with the right technical setup, the content of the email may still raise red flags. It does not have to be obviously suspicious. An exaggerated subject line, too many links, a large attachment or a message made almost entirely of one image can increase the risk.
This does not mean there is a universal list of forbidden words. Modern spam filters evaluate the complete message, the sender’s behaviour and the previous relationship between both parties.
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Use clear subject lines
Avoid misleading titles, excessive capital letters and unrealistic promises.
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Do not overuse links and attachments
Share only what is necessary and use reliable platforms when files are too large.
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Keep your signature professional
Include genuine company details and avoid oversized images or unnecessary links.
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Do not send campaigns from a standard mailbox
Mass communications should be managed with tools designed specifically for that purpose.
How to improve email deliverability
The first step is to review the DNS configuration of the domain and confirm that SPF, DKIM and DMARC are implemented correctly. You should then analyse the domain reputation, check for possible blacklists and make sure no account is sending messages without authorisation.
It is also important to use a professional business email service, protect accounts with multi-factor authentication and avoid sharing passwords between employees.
Platforms such as Microsoft 365 or Google Workspace can provide a more reliable infrastructure, but simply purchasing a licence is not enough. The initial configuration, security policies and domain management must also be handled correctly.
How Open Tech can help
At Open Tech, we review the technical configuration of your corporate email, including DNS records, domain authentication and account security. We also investigate why specific messages are being rejected or classified as junk.
We can help you configure and manage Microsoft 365, Google Workspace and other email platforms, while strengthening account protection and preventing fraudulent messages from being sent from your domain.
A professional review makes it possible to identify whether the problem comes from the domain, the mail server, the sender reputation or the sending habits. This prevents your company from trying random solutions that never address the real cause.
Make sure your emails reach the right inbox
When your emails go to spam, the cause may be related to domain authentication, sender reputation, message content or the email service configuration. Finding the source of the problem is essential to rebuilding trust with email providers.
At Open Tech, we can review your business email environment and help improve message delivery so your communications do not go unnoticed.
Review your business email