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My Emails Are Landing in Spam – How Do I Fix It?
Troubleshooting
Blog > Troubleshooting > Emails going to spam
By Nikita Bykadarov, CEO of Maildoso · Updated June 15, 2026
My Emails Are Landing in Spam – How Do I Fix It?
Based on patterns we see across 400,000+ mailboxes and 10M+ emails sent per day on Maildoso infrastructure.
Short answer: Emails land in spam for three reasons: weak sender reputation, broken authentication, or spammy content and lists. Fix them in that order. Confirm it's a placement problem with a seed test, check SPF/DKIM/DMARC and your blacklist status, then cut volume, clean your list, and re-warm the mailbox. Most cases trace back to sending from infrastructure that was never built for cold email.
Short answer: Emails land in spam for three reasons: weak sender reputation, broken authentication, or spammy content and lists. Fix them in that order. Confirm it's a placement problem with a seed test, check SPF/DKIM/DMARC and your blacklist status, then cut volume, clean your list, and re-warm the mailbox. Most cases trace back to sending from infrastructure that was never built for cold email.
Key Takeaways
- Spam placement comes from three layers – reputation, authentication, and content – and you fix them in that order.
- Confirm it's a placement problem with a seed test before making any changes; blind changes usually make it worse.
- The single most common root cause is sending cold mail from the wrong infrastructure (free Gmail, your main domain, one Workspace tenant).
- Recovery takes two to four weeks. There's no overnight fix – prevention is the fast path.
How to tell it's a spam problem, not something else
Open rates are the giveaway. If they dropped sharply and stayed down, your mail is being filtered before anyone sees it.
Other signs:
Other signs:
- Your own test emails land in the spam or Promotions tab, not the primary inbox.
- Replies dried up even though your list and copy didn't change.
- Bounces and "blocked" rejections are climbing.
- The drop happened across providers – Gmail, Outlook, and Yahoo all at once.
Diagnose the cause before you change anything
Spend ten minutes confirming the cause. Changing things blindly usually makes placement worse.
- Run a seed/placement test. Send to a spread of fresh Gmail, Outlook, and Yahoo inboxes and note where you land. This tells you whether it's reputation or a single filter.
- Check your authentication. Verify SPF, DKIM, and DMARC all pass for the sending domain. One broken record is enough to route you to spam.
- Check blacklists. Look up your domain and sending IP on Spamhaus and Barracuda. A listing is hard proof of reputation damage.
- Check Google Postmaster Tools. A red domain reputation or a spam-rate spike points straight at the cause.
- Pin the timeline. Find the day placement dropped and what changed that day – a volume jump, a new list, an edited DNS record.
Why cold emails go to spam (ranked by how common it is)
- Sending from the wrong infrastructure. Free Gmail or a single Workspace tenant blasting cold mail gets filtered fast. This is the most common root cause and the one people overlook.
- Volume ramped too fast. A new mailbox sending hundreds of emails on day one looks exactly like a spammer to Gmail.
- Broken or missing authentication. No SPF, DKIM, or DMARC means providers can't verify you, so they default to caution.
- Bad list. Scraped or stale addresses drive bounces and spam complaints, and both wreck placement quickly.
- Spammy content. Spam-trigger words, link-heavy emails, big images, and aggressive copy all push you toward the spam folder.
- No engagement. When recipients never open or reply, providers read that as "unwanted" and adjust placement down.
The fix, step by step
Stop making it worse (today)
- Pause campaigns on the affected mailboxes. Sending more while filtered deepens the reputation hit.
- Pull bad mailboxes out of your sequencer so it stops routing through them.
- Quarantine the list that correlates with the drop if a specific batch spiked bounces or complaints.
Fix the foundation
- Repair authentication. Make SPF, DKIM, and DMARC pass for every sending domain. This is the fastest high-impact fix and the most commonly broken.
- Get off blacklists. If you're listed, follow each blacklist's delisting process – but only after you've fixed what got you listed, or you'll land right back on.
- Clean the list. Verify addresses before they touch a live mailbox. Remove anything that bounced. Cheap data that bounces is the most expensive data there is.
- Fix the copy. Cut spam-trigger language, trim links to one, drop heavy images, and write like a person sending one email – because providers reward mail that reads that way.
Rebuild reputation
- Cut volume hard and ramp back up slowly over weeks, not days.
- Re-warm the mailbox so it rebuilds positive engagement signals before it carries real campaigns.
- Retest placement weekly with seed inboxes and watch the trend, not a single day.
How to keep your mail in the inbox
Placement problems are usually infrastructure problems.
The durable fixes are structural:
This is the case for purpose-built infrastructure over DIY Gmail accounts. Maildoso provisions domains and mailboxes with SPF, DKIM, and DMARC auto-configured, warmup built in, and one-click connection to Instantly, Smartlead, and other sequencers – so the conditions that send mail to spam don't exist in the first place.
The durable fixes are structural:
- Send cold mail from dedicated secondary domains, never your main domain. A spam hit then never touches your real email.
- Authenticate automatically. SPF, DKIM, and DMARC configured correctly from day one removes the most common cause.
- Warm every new mailbox before it sends a single campaign.
- Spread volume across many mailboxes at low daily limits instead of pushing a few hard.
- Keep lists verified so bounces and complaints stay low.
This is the case for purpose-built infrastructure over DIY Gmail accounts. Maildoso provisions domains and mailboxes with SPF, DKIM, and DMARC auto-configured, warmup built in, and one-click connection to Instantly, Smartlead, and other sequencers – so the conditions that send mail to spam don't exist in the first place.
FAQ
- Q:Why are my emails going to spam all of a sudden?A:A sudden drop is almost always reputation or authentication, not copy. You likely ramped volume too fast, mailed a bad list, or broke an SPF/DKIM/DMARC record. Run a seed test to confirm placement, then trace it to the day it dropped.
- Q:How do I check if my emails are going to spam?A:Send to seed inboxes across Gmail, Outlook, and Yahoo and see where you land. Pair that with Google Postmaster Tools for your domain reputation and a blacklist lookup for your domain and IP.
- Q:Does warmup stop emails going to spam?A:Warmup builds the reputation that keeps you in the inbox, but it only holds if the rest is right. If you resume the same volume, list, or broken authentication that filtered you, you'll land in spam again.
- Q:Can spam-trigger words alone send me to spam?A:Rarely on their own. Modern filters weight reputation and engagement far more than individual words. But heavy spam language stacked on weak reputation tips you over – so clean copy helps, it just isn't the whole fix.
- Q:How long until my emails reach the inbox again?A:Plan on two to four weeks once you've fixed the cause and started re-warming. Reputation recovers slowly, and pushing volume to test it just re-filters you.
Key terms in this guide
Sources & references
About the author
Written by Nikita Bykadarov, CEO of Maildoso.
Nikita is founder and CEO of Maildoso, the cold email infrastructure platform powering 400,000+ mailboxes and 10M+ sends per day for 6,000+ companies. Because deliverability is his business, his team sees exactly why mail lands in spam and what brings it back – across thousands of domains and live campaigns. That's what informs the fixes here.
Last updated: June 2026.
- Sender reputation – a score mailbox providers assign to your domain and IP based on how recipients react to your mail. Low reputation routes you to spam.
- Email authentication (SPF, DKIM, DMARC) – DNS records that prove your mail is really from you. SPF lists who can send for your domain, DKIM signs the message, DMARC tells receivers what to do when checks fail.
- Seed/placement test – sending to a set of known inboxes across providers to see whether you land in primary, Promotions, or spam.
- Warmup – gradually increasing a new mailbox's sending while generating positive engagement, so it builds reputation before carrying real campaigns.
- Blacklist (RBL) – a public list of domains and IPs flagged for spam. Being listed blocks or filters your mail until you're removed.
Sources & references
- Google – Email sender guidelines (bulk sender requirements, authentication, spam rate)
- Google – Postmaster Tools (domain and IP reputation, spam rate monitoring)
- Spamhaus – Blocklist Removal Center
- Maildoso – Cold Email Deliverability Guide
- Maildoso deliverability stats – placement data measured across client campaigns at scale
About the author
Written by Nikita Bykadarov, CEO of Maildoso.
Nikita is founder and CEO of Maildoso, the cold email infrastructure platform powering 400,000+ mailboxes and 10M+ sends per day for 6,000+ companies. Because deliverability is his business, his team sees exactly why mail lands in spam and what brings it back – across thousands of domains and live campaigns. That's what informs the fixes here.
Last updated: June 2026.
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