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Definition
💡 Flagged as spam: When an email gets automatically detected and moved to the spam folder instead of landing in your inbox. Either your email provider's filters caught something suspicious, or you (or someone else) manually marked it as junk..
Why do emails get flagged as spam?
Your inbox would be a disaster without spam filters. According to Statista, about 45% of all emails sent globally are spam. That's billions of unwanted messages every day.
Email providers use spam filters to automatically catch suspicious messages. These filters analyze sender reputation, content patterns, links, formatting, authentication records. If enough red flags pop up, the email gets routed to spam.
Sometimes this works perfectly. But sometimes legitimate emails get caught too. That newsletter you signed up for. Your friend's email from a new address. A receipt from an online purchase.
If you're a business sending emails, getting flagged as spam tanks your email deliverability. Your open rates plummet. Your reputation score drops, making future emails even more likely to be filtered.
How spam flagging works
Automatic filtering is the first line of defense. Your email client runs every incoming message through a spam detection algorithm. This checks:
- Does the sender have proper email authentication (SPF, DKIM, DMARC)?
- Is the sender's IP address on any blacklists?
- Does the message contain spammy keywords?
- Are there suspicious links or attachments?
If the message scores too high on spam probability, it gets flagged and redirected to your spam folder automatically.
Manual flagging happens when you mark an email as spam. Click "Report spam" and you're telling your email provider "this is junk." The provider updates its filters and might start blocking future emails from that sender.
Sender reputation plays a huge role. Email providers track how often messages from a specific domain get marked as spam. If enough people flag emails from sender@example.com, the provider assumes that sender is problematic and starts automatically filtering their messages.
How to avoid being flagged as spam (for senders)
If you're sending emails and they keep getting flagged, here's what to fix:
Set up proper authentication. Configure SPF, DKIM, and DMARC records for your domain. These prove you're authorized to send emails from your address. Most providers won't deliver messages without proper authentication anymore.
Avoid spam trigger words. Subject lines with "FREE!!!", "ACT NOW", "GUARANTEED" get flagged fast. Same goes for all-caps text or excessive punctuation.
Make unsubscribing easy. Include a clear unsubscribe link in every marketing email. If people can't opt out, they'll mark you as spam instead.
Don't buy email lists. Sending to people who never asked for your emails is a surefire way to get flagged. Build your list organically with double opt-in signups.
How to fix spam filtering or remove emails from spam (for recipients)
If legitimate emails keep landing in your spam folder, you can train your filter to recognize them as safe.
In Gmail:
- Click More on the left sidebar, then Spam
- Find the email that shouldn't be there
- Check the box next to it
- Click Not spam at the top
Gmail moves it to your inbox and learns that future emails from that sender are legitimate. You can also add the sender to your contacts or create a filter to make sure their emails never get flagged.
In Outlook:
- Go to your Junk Email folder
- Right-click the email
- Select Junk > Not Junk
For better control, go to Settings > Mail > Junk email and add trusted senders to your Safe Senders list.
In Spark:
- Open your Spam folder
- Right-click the email > Move to INBOX.
Spark respects spam settings from your email provider (Gmail, Outlook, etc.). Alternatively, you can control new senders with the Gatekeeper in Spark, which is an even easier way to control what gets into your inbox.
Keeping your inbox clean
Check your spam folder regularly. Legitimate emails slip through sometimes. A quick scan can catch important messages.
Whitelist important senders. Add people whose emails you never want filtered to your safe senders list.
Mark spam, don't just delete it. This trains your filter and helps protect others.
Be careful what you mark as spam. Only flag actual spam. Unsubscribe from newsletters instead of marking them as spam.