You've written a solid outbound sequence. The messaging is sharp, the targeting is tight, and your AI email campaigns are queued and ready to go. Then the results come back: 8% open rate, zero replies, and a growing suspicion that nobody is actually seeing your emails.
If an outbound sequence performs poorly, investigate authentication, delivery feedback, audience relevance and message quality. No single cause should be assumed from an open-rate result.
What DNS Records Actually Do for Your Outbound Email
DNS records are the authentication layer that proves to receiving mail servers that you are who you say you are. Without them configured correctly, Gmail, Outlook, and other providers have no way to verify your domain. The result is simple: your emails go to spam, or they don't arrive at all.
There are three records every outbound sender needs to understand.
SPF (Sender Policy Framework) tells receiving mail servers which IP addresses are allowed to send email on behalf of your domain. If you're sending through a platform like Kolvera, Google Workspace, or any third-party tool, and your SPF record doesn't include that sending infrastructure, your emails will fail authentication checks.
DKIM adds a domain signature that receiving systems can verify using a published key. Passing DKIM helps authentication; it does not prove that a message is wanted or guarantee inbox placement.
DMARC relates the visible sender domain to authenticated SPF or DKIM identifiers and publishes a policy for failures. Configure it with your sending provider and review reports before changing enforcement.
Inspect SPF, DKIM and DMARC using your provider instructions and DNS tools. Confirm alignment and reporting across legitimate senders; choose enforcement based on actual findings rather than a fixed waiting period.
The Sending Domain vs Your Main Domain
A lot of sales teams make the same mistake: they set up their shiny new outbound campaigns and send directly from their primary company domain. That's the domain on your website, your support emails, and every other business communication you send.
If that domain ends up with a damaged reputation because of aggressive outbound, your whole business email operation suffers. Transactional emails, invoices, client responses. All of it.
Choose a sending domain structure with the mailbox provider and your email administrator. A separate domain or subdomain does not guarantee that reputation effects are isolated from the rest of the business.
This is standard practice in B2B sales, but it's still skipped constantly by smaller teams and recruitment agencies who are just getting started with structured outbound. The short-term convenience of sending from your main domain is not worth the long-term risk.
Inbox Warming: Why You Can't Just Start Sending at Volume
Even if your DNS is perfect, a brand-new domain or email address has no sending history. Mail providers don't know you. They haven't seen consistent engagement from your address, and they have no reason to trust that your messages are wanted.
A sudden volume increase can create delivery problems, especially without established sending history. Review provider feedback and recipient expectations before increasing activity.
Inbox warming is the process of building that reputation gradually. It means starting with a low daily send volume, getting real positive engagement (opens, replies, emails moved out of spam), and slowly increasing over several weeks. There are dedicated warming tools that automate this by having your address exchange emails with a network of other addresses, mimicking genuine correspondence.
Increase sending cautiously based on domain history and actual feedback. No fixed warming duration or daily schedule guarantees a domain is ready for a particular campaign.
The 2024-2025 Bulk Sender Rules You Cannot Ignore
The deliverability landscape changed significantly over the last two years. If you're running outbound and you haven't kept up, you're sending into a tighter set of rules than the one you remember.
Google and Yahoo publish authentication and bulk-sender requirements. Their definitions and conditions should be checked separately: Google guidance and Yahoo guidance.
Microsoft documents authentication requirements and rejection handling for high-volume senders to its consumer email services. Follow its current support guidance; do not apply those conditions indiscriminately to every Microsoft 365 recipient.
Most Australian recruitment and B2B teams send well under 5,000 emails per day to consumer addresses, so the bulk-sender threshold doesn't strictly apply. But the rules signal where the entire industry is heading. The same authentication standards now influence inbox placement decisions for senders well below the formal threshold. If your DNS is shaky, you'll feel the pressure even if you never hit 5,000 sends.
Check each receiving provider's current requirements and the actual bounce or deferral response. Authentication failure handling is provider-specific rather than a universal rule for every email.
How This Connects to AI Email Sequences Specifically
AI-generated email sequences create a specific deliverability risk that's worth understanding. When you're sending personalised, multi-step sequences to a list of prospects, you're often sending a higher volume of outbound than a team would have managed manually. That's the point. The efficiency is real.
But that same efficiency means deliverability issues scale just as fast as the sending volume does. If your DNS is broken or your domain is cold, the problem doesn't stay small for long. One bad week of sending from an unprepared domain can take your sender reputation from clean to damaged before you've had a chance to notice.
Good AI email campaign platforms account for this. Kolvera's multi-step outbound sequences include auto-pause on reply, which means the system stops contacting a prospect the moment they respond. That's not just a nice feature for managing replies, it's also a deliverability behaviour. Sending emails to people who've already engaged reduces the chance of complaints, and keeping sequences relevant reduces unsubscribes. Both matter to your sender reputation.
But the platform can only do so much. The DNS setup and warming process has to happen on your side, before you start sending.
A Practical Checklist Before You Launch Any Outbound Sequence
Before you send your first AI email campaign, work through this list.
DNS records: follow the connected sending provider's SPF, DKIM and DMARC instructions. Review alignment and reports across legitimate senders before changing enforcement policy.
Sending domain: Decide whether you're sending from your primary domain or a dedicated subdomain. For any serious outbound volume, a dedicated domain is the right call.
Warming period: decide the next volume increase from authentication checks, recipient feedback and provider requirements, rather than a universal four-to-six-week rule.
Test the actual message and domain configuration before launch. Diagnostic tools can identify issues; a particular score does not guarantee inbox placement.
Monitor after you send: Watch your bounce rate and spam complaint rate. Google Postmaster Tools is free and gives you visibility into how Gmail treats your domain.
When messages land in spam, inspect authentication, recipient relevance, complaint feedback and delivery errors. Use the receiving provider's current guidance to decide what to change.
The Bigger Picture for Australian Sales Teams
For Australian recipients, identify the actual receiving service and inspect its current requirements. Consumer Outlook.com conditions should not be treated as identical to every enterprise Microsoft 365 configuration.
Review contact data before sending and monitor bounces afterwards. A previously verified address may become unavailable; enrichment does not guarantee a low bounce rate.
Kolvera supports contact enrichment and campaign workflows. Review enrichment results and campaign eligibility before activation, then monitor delivery feedback rather than assuming every address will accept the message.
Getting the Foundation Right
AI email campaigns are genuinely useful for outbound sales. The ability to run personalised, multi-step sequences without manual follow-up effort is a real advantage for recruitment agencies, IT businesses, and B2B sales teams running lean. But none of that matters if the emails don't arrive.
DNS setup and inbox warming are not technical hurdles you can skip and fix later. They're the foundation. Get them right before you send a single sequence, and your campaign results will reflect the effort you put into the messaging itself. Skip them, and you'll spend months wondering why good copy isn't converting.
If you want to see how Kolvera handles the campaign side of this, including auto-pause on reply and contact enrichment, you can book a demo or start a trial and explore it on your own terms.