How do I stop my bulk emails going to spam?

Publish SPF, DKIM, and DMARC records for your sending domain, keep complaint rates under about 0.1%, remove hard bounces and long-term non-openers, and ramp volume gradually rather than sending to a large list on day one.

What are SPF, DKIM, and DMARC?

SPF lists which servers may send for your domain, DKIM cryptographically signs each message so receivers can verify it, and DMARC tells receivers what to do when either check fails and requests failure reports. Google and Yahoo require authentication for bulk senders.

Does the wording of my email affect deliverability?

Far less than people assume. Modern filters weigh sender reputation and recipient engagement much more heavily than specific words. A trusted sender can use words like 'free' without penalty.

What is a safe complaint rate?

Below roughly 0.1%, or one spam complaint per thousand delivered messages. Above 0.3% mailbox providers begin throttling or blocking your mail.

Should I email people who never open anything?

No. Persistent non-openers drag down your engagement score and reduce inbox placement for the people who do want your mail. Remove contacts inactive for six months or more.

Reach Inboxes, Not Spam: Bulk Email Best Practices

Cost-efficient bulk email for small businesses, freelancers, and marketers—without per-subscriber traps and inflated tiers. Reach inboxes, not spam.

Deliverability is mostly infrastructure, not copywriting. Before you rewrite a subject line, get the three DNS records right and stop mailing addresses that do not want you. That is where almost all inbox placement is won or lost.

Spam filters judge the sender, not the sentence

Most advice about avoiding spam folders focuses on wording — avoid "free", do not use too many exclamation marks. That advice is twenty years out of date. Modern filters at Gmail, Outlook, and Apple Mail weigh who is sending and how recipients react far more heavily than what the message says.

A trusted sender can write "FREE OFFER" in the subject line and land in the inbox. An unauthenticated sender with a cold list will land in spam writing perfect prose. Fix the sender first.

The three DNS records that decide everything

These are not optional extras. Since 2024, both Google and Yahoo require authentication for anyone sending in volume, and unauthenticated bulk mail is increasingly rejected outright rather than filtered.

SPF lists which servers are allowed to send for your domain. Published as a TXT record. If you send through Google Workspace, that means including _spf.google.com. Without it, receivers cannot tell your mail from a forgery.
DKIM adds a cryptographic signature to every message, so the receiver can verify it was not altered in transit and genuinely came from your domain. Your mail provider gives you the key to publish.
DMARC tells receivers what to do when SPF or DKIM fails, and asks them to report failures back to you. Start at p=none to observe, then tighten to quarantine once your reports are clean.

You can check all three in a minute with any public DNS lookup tool. If any are missing, that is your single highest-impact fix — bigger than anything you could do to the email itself.

Reputation is earned per domain and per IP

Mailbox providers build a running score for your sending domain based on how people treat your mail. The inputs that matter most:

Complaint rate. People clicking "report spam". Keep it below roughly 0.1% — one complaint per thousand. Above 0.3% and you are in real trouble.
Hard bounces. Mail to addresses that do not exist signals you did not get permission or never clean your list.
Engagement. Opens, replies, and time-in-inbox raise your score. A list where nobody opens anything slowly poisons everything you send.
Spam-trap hits. Addresses that exist purely to catch senders using purchased lists. One hit can be costly.

Warming up, and why volume spikes hurt

A domain that has never sent bulk mail has no reputation at all, and mailbox providers treat unknown senders cautiously. Going from zero to ten thousand emails in one day looks exactly like a compromised account.

Ramp instead. Start with your most engaged contacts — people who recently bought or replied — in batches of tens, then hundreds. Early positive engagement builds the reputation that later, larger sends depend on. This takes a couple of weeks and it is the difference between arriving and disappearing.

List hygiene beats list size

The instinct is to mail everyone. The arithmetic argues otherwise: a list of 500 engaged people outperforms 5,000 indifferent ones, because the indifferent 4,500 actively damage your ability to reach the 500.

Practical rules: remove hard bounces immediately. Stop mailing anyone who has not opened anything in six months. Never buy a list — purchased addresses are the fastest route to spam traps. Make unsubscribing one click, because someone who cannot find the unsubscribe link clicks "report spam" instead, and that costs you far more.

Things that genuinely do affect placement

Send from a real, monitored address rather than noreply@ — replies are a strong positive signal. Keep a sensible text-to-link ratio; a message that is one image and one tracking link looks like a template farm. Use a consistent from-name and sending schedule, since erratic patterns read as compromise. And avoid link shorteners, which are heavily abused and often flagged on sight.

Where Envora fits

Envora is our bulk email dispatch app for iPhone, built for small businesses and freelancers who need to send real volume without per-subscriber pricing. It handles the dispatch side; authentication lives in your DNS, and the checklist above is what you should verify before your first campaign regardless of which tool you use.