Why Your Emails Go to Spam: Causes and a Fix Order
Why do emails land in the spam folder? Authentication records, content, list quality, sending habits and blocklists, with a step-by-step fix order.
rabbitclip teamPublished: 7 min read
Short answer
Emails land in the spam folder because the recipient's provider cannot confirm that the sending address really belongs to you, does not trust the way the message was sent, or finds the content or the list suspicious. The causes fall into five groups: missing or faulty authentication records (SPF, DKIM, DMARC), suspicious content, a poorly kept list, irregular sending habits, and a sending domain or server address that has ended up on a blocklist. The fix follows the same order: records first, then list and content, and reputation last.
A spam decision is never made by one rule. The receiving provider weighs many signals together and rarely explains itself. So saying that a message went to spam describes a symptom, not a diagnosis. To diagnose it you need to know which address sent the message, to whom, and with what content.
Below is an order you can use to narrow the problem yourself: causes, records, content and list, sending habits and blocklists, and then the fix steps.
Why do my emails keep landing in spam?
Providers ask two questions. Did this message really come from the address it claims, and does the recipient want to receive it? Authentication records answer the first. Content, list quality and the way earlier messages were received answer the second.
That is why the same message can reach the inbox of one recipient and the spam folder of another. Every provider has its own rules and every recipient has their own history. You clean up the causes on your side that can be fixed; the rest is up to the provider and the recipient.
- Authentication: SPF, DKIM and DMARC records are missing, wrong or in conflict
- Content: image-only messages, suspicious links, shouting subject lines
- List: collected without permission, old, full of bouncing addresses
- Sending habits: sudden jumps in volume, bulk sends after a long silence
- Reputation: the domain or server address sits on a blocklist
What happens if SPF, DKIM and DMARC are missing?
SPF declares which servers may send mail on behalf of your domain. DKIM shows that the message was not altered on the way and carries your domain's signature. DMARC tells the receiver what to do when those two fail. All three live in your domain's DNS records. We covered the detail in our SPF, DKIM and DMARC guide, so here we look only at what matters for spam.
The most common fault is that not every service that sends mail has been added to the records. Your website sends from one server, your newsletter from a mailing service and your invoices from accounting software, and each one must be declared. There is one more trap: a domain should carry only one SPF record. Adding a second record invalidates both, so services have to be merged into a single record.
The email DNS check tool on our site shows whether these records exist and how they are formed. Use it to find a record error, not as a guarantee of deliverability.
Why do content and list quality matter so much?
Providers do not look only at technical records. They also watch whether recipients open the messages from an address, delete them, or mark them as spam. An unwanted list lowers your reputation even if your records are flawless.
The usual content problems are an image-only message, shortened links or links that redirect elsewhere, heavy emphasis in the subject line, a subject that does not match the sender name, and no unsubscribe link. Keep text and images balanced, and keep links on your own domain.
- Send only to people who have given you permission
- Do not use a bought or scraped list
- Remove addresses that bounce
- Prune people who have not opened anything for a long time
- Make unsubscribing easy and visible
How do sending habits and blocklists affect delivery?
A new domain or a new sending service has no reputation history. A large first send to a big list on day one raises suspicion; it is safer to start with a small, relevant audience and raise the volume over time. Rhythm matters too. Staying silent for months and then sending in bulk unsettles your reputation.
A blocklist holds server addresses that have been found to send spam or to have been compromised. On shared hosting, a mistake by another site on the same server address can touch you as well. If you suspect a listing, check your address with blocklist lookup services. If you are listed, remove the cause first (a hijacked form, a leaked password) and then follow the delisting process of the organisation that runs the list. A request made without fixing the cause gets nowhere.
In what order should you fix the problem?
Do not change things at random. Go in order, send a test message after each step and note the result.
If things do not improve after these steps, the problem is most likely reputation. Reputation recovers over time, not through a single setting. Steady, measured sending is the only route here.
- Work out which address lands where, and whether it is every recipient or only certain providers
- Complete the SPF, DKIM and DMARC records for every service that sends mail
- Make the sender name, reply address and domain consistent
- Clean the list: remove bounces and people who show no interest
- Simplify the content: balanced text, links on your own domain, a clear unsubscribe
- Check whether the server address is on a blocklist and write to your hosting provider if needed
Which mistakes are common when fixing spam problems?
The first mistake is setting up the records once and forgetting them. If you add a new email service, change hosting or move the domain and the records are not updated, authentication breaks. The second is pushing the problem onto the recipient: telling people to check their spam folder is a stopgap, not a repair.
The third is leaving the messages your website sends, such as contact form replies and order notifications, to the server's default sending. These often leave through an unauthenticated channel and end up in spam. The right way is to send them through a service that is declared for your domain. The fourth is asking to be removed from a blocklist without fixing the cause.
When is the problem not the spam filter?
Not every missing message is spam. If a message never arrives and is not in the spam folder either, the cause is usually a rule on the recipient's side, a full mailbox or the server refusing the message. The error notice that comes back from the sending server is the real clue in that case, so read it and keep it.
A spam problem reported by a single person is also usually in that person's filter, and adding your address to their contacts is enough. If many different recipients report the same thing, look into technical causes. If the picture is confusing, show a specialist the message header, because headers state the authentication results plainly.
A message in the spam folder usually means that authentication, the list or sending habits have broken down, and working in order will show you which. Complete the records first, then fix the list and content, check blocklists and keep your sending steady. In a discovery call, rabbitclip can look at your domain's email setup with you.
FAQ
Why do my emails go to spam with only one provider?
Each provider has its own rules and each recipient has their own history. Send a test message to that provider, read the authentication results in the message header and read the provider's guidance for senders.
Is setting up SPF, DKIM and DMARC enough?
It is necessary but not sufficient. The records confirm who sent the message; the content, the list and your sending habits also have to be clean.
How can a message that went to spam be rescued?
The recipient can mark it as not spam and add your address to their contacts. That works for one recipient; the lasting fix lies in the records, the list and your reputation.
How long does it take to leave a blocklist?
It depends on the organisation that runs the list and the reason for the listing. A request made without fixing the cause gets nowhere, so close the source first.
