Why are my cold emails going to spam?

Your sending domain is not authenticated

If SPF, DKIM and DMARC are not set up correctly, receiving servers cannot verify that you are who you claim to be. Gmail and Microsoft now treat this as close to mandatory for bulk senders, and unauthenticated mail is filtered aggressively.

This is the first thing to check because it is both the most common cause and the easiest to fix.

The domain is too new or was never warmed

A domain registered last week that suddenly sends hundreds of emails looks exactly like a throwaway spam domain, because that is what throwaway spam domains do. Reputation is earned gradually.

Warming means starting at low volume and increasing slowly while engagement stays healthy. Skipping it is the second most common reason for spam placement.

You are sending too much, too fast

Volume spikes are a strong spam signal. A mailbox that sends thirty emails a day for a month and then sends four hundred in an afternoon will be throttled or filtered.

Steady, predictable volume per mailbox beats bursts every time, which is why we cap daily sending per client rather than pushing for maximum output.

Your list quality is poor

High bounce rates tell the receiving server that you are sending to addresses you have no relationship with. Sending to old, scraped, or unverified data is the fastest way to damage a domain.

Bounces should be removed permanently and immediately, not retried.

The content itself is triggering filters

Heavy formatting, multiple links, tracking pixels, image heavy templates, and classic sales language all push mail towards the spam and promotions folders. Plain text style messages that read like something a person actually typed perform better and filter better.

Long unbroken pitches also perform badly. If the email looks like a brochure, it gets treated like one.

People are marking you as spam

This is the signal that matters most and the hardest to recover from. If recipients report your messages, no amount of technical setup will save the domain.

Complaints come from irrelevance far more than from cold contact itself. Emailing someone about something genuinely connected to their role rarely generates complaints. Blasting everyone on a list does.

How Leadhaus handles this

Authentication is configured on every sending domain before a single message goes out. Domains are warmed before use. Daily volume is capped per client. Bounces are suppressed automatically and complaint rates are monitored continuously, and where a campaign starts to underperform we pause it and adjust before the domain is damaged.