Running a small business in a northern or remote community means your email list is often your most reliable marketing channel. Social media algorithms shift, ad costs climb, and broadband can be unpredictable — but a well-managed email program reaches customers directly. The problem is that Gmail, which handles a significant share of personal inboxes worldwide, has tightened its sender requirements, and many small businesses are unknowingly failing basic authentication checks that push their messages into spam.
This Gmail sender requirements checklist walks you through every step you need to take — from DNS records to unsubscribe links — so your emails land where they belong: in the inbox.
Step 1: Determine Whether You Are a Bulk Sender
Before diving into technical settings, you need to know which rules apply to you. Gmail distinguishes between general senders and bulk senders.
You are a bulk sender if you send more than 5,000 messages to personal Gmail accounts (addresses ending in @gmail.com or @googlemail.com) within a 24-hour period. If you are below that threshold, a lighter set of requirements applies — but you still need to meet the baseline.
Baseline requirements for all senders:
– Your sending domain must have valid SPF or DKIM authentication
– Your sending IP must have valid forward and reverse DNS records
– You must use TLS encryption for transmitting email
– Your spam rate (as measured in Google Postmaster Tools) must stay below 0.3%
– Your messages must follow RFC 5321 and RFC 5322 formatting standards
Most small northern businesses fall below the 5,000-message threshold, but it is worth checking your email service provider’s sending logs to confirm.
Step 2: Set Up SPF, DKIM, and DMARC
Authentication is the foundation of email deliverability. These three DNS records tell Gmail that your messages genuinely come from your domain.
SPF (Sender Policy Framework)
SPF is a DNS TXT record that lists the mail servers authorized to send email on behalf of your domain. Your email service provider (Mailchimp, Klaviyo, ActiveCampaign, etc.) will give you the exact SPF record to add to your domain’s DNS settings.
How to add SPF:
1. Log in to your domain registrar (e.g., GoDaddy, Namecheap, or your hosting provider)
2. Navigate to DNS management
3. Add a TXT record with the value your email provider specifies (e.g., v=spf1 include:sendgrid.net ~all)
4. Allow up to 48 hours for propagation
DKIM (DomainKeys Identified Mail)
DKIM adds a cryptographic signature to your outgoing emails. Gmail uses this signature to verify that the message was not altered in transit.
How to enable DKIM:
1. In your email service provider’s settings, find the DKIM or domain authentication section
2. Copy the CNAME or TXT records provided
3. Add them to your domain’s DNS settings
4. Verify the setup in your email provider’s dashboard
DMARC (Domain-based Message Authentication, Reporting, and Conformance)
DMARC builds on SPF and DKIM by telling Gmail what to do when a message fails authentication. It also sends you reports about who is sending email using your domain.
Minimum DMARC record for compliance:
v=DMARC1; p=none; rua=mailto:dmarc-reports@yourdomain.com
Start with p=none (monitor mode) so you can review reports before enforcing stricter policies. Bulk senders must have DMARC in place; all senders benefit from it.
Tip: Use a free tool like MXToolbox or Mail-Tester to verify your SPF, DKIM, and DMARC records are correctly configured.
Step 3: Check Your DNS and Message Formatting
Beyond authentication records, Gmail checks a few additional technical requirements.
DNS requirements:
– Your sending IP address must have a PTR record (reverse DNS) that resolves to a hostname
– That hostname must forward-resolve back to the same IP
– Contact your email service provider or hosting company if you are unsure — most managed sending services handle this automatically
Message formatting requirements:
– Use a consistent, recognizable “From” name and address
– Do not use misleading subject lines or headers
– Include a valid physical mailing address in every marketing email (required by CAN-SPAM and CASL)
– Ensure your HTML email is well-formed and renders correctly on mobile devices
Step 4: Add One-Click Unsubscribe to Marketing Emails
Since February 2024, Gmail requires that marketing emails and subscribed messages include a one-click unsubscribe mechanism. This is not just a best practice — it is a requirement for bulk senders and strongly recommended for all senders.
What one-click unsubscribe means:
– A visible “Unsubscribe” link must appear in the email body
– Gmail also displays an unsubscribe button in the email header for qualifying messages
– Clicking unsubscribe must remove the subscriber within two business days — no confirmation pages, no re-engagement prompts before removal
Most modern email service providers (Mailchimp, Klaviyo, ConvertKit, etc.) handle the technical implementation of one-click unsubscribe automatically. Check your platform’s settings to confirm it is enabled.
For northern businesses using older or custom-built email systems: You may need to add the List-Unsubscribe and List-Unsubscribe-Post headers manually. Consult your developer or switch to a managed email platform.
Step 5: Monitor Your Spam Rate in Google Postmaster Tools
Google Postmaster Tools is a free dashboard that shows you how Gmail perceives your sending domain. It is one of the most valuable — and underused — tools available to email marketers.
How to set up Postmaster Tools:
1. Go to postmaster.google.com
2. Sign in with a Google account
3. Add and verify your sending domain
4. Wait 24–48 hours for data to populate (you need a minimum sending volume to see metrics)
Key metrics to watch:
| Metric | Target | Action Required |
|---|---|---|
| Spam Rate | Below 0.10% | Investigate if rising |
| Spam Rate | 0.10%–0.30% | Immediate list hygiene |
| Spam Rate | Above 0.30% | Gmail may block delivery |
| Domain Reputation | High or Medium | Maintain current practices |
| IP Reputation | High or Medium | Contact your ESP if low |
Practical tips for keeping spam rates low:
– Remove inactive subscribers (no opens or clicks in 6–12 months) from your active list
– Never purchase email lists
– Send only to people who explicitly opted in
– Use double opt-in for new subscribers when possible
– Segment your list and send relevant content to each segment
For more on building a sustainable email program, see our guide on email automation for remote businesses and our deep dive on mastering email deliverability in 2026.
Step 6: Increase Sending Volume Safely
If you are growing your email list or planning a larger campaign, increase your sending volume gradually. Sudden spikes in volume from a new or low-reputation domain trigger Gmail’s spam filters.
Volume ramp-up guidelines:
– Start with your most engaged subscribers (recent openers and clickers)
– Increase daily send volume by no more than 20–30% per week
– Monitor Postmaster Tools daily during ramp-up
– Pause and investigate if spam rates rise above 0.10%
This is especially important for northern businesses launching seasonal campaigns — a large winter promotion sent to a cold list can damage your domain reputation for months.
Your Gmail Deliverability Quick-Reference Checklist
Use this checklist before every major campaign:
- [ ] SPF record added and verified
- [ ] DKIM enabled and verified in your email platform
- [ ] DMARC record in place (at minimum
p=nonewith reporting) - [ ] Reverse DNS (PTR record) configured for your sending IP
- [ ] One-click unsubscribe enabled in your email platform
- [ ] Physical mailing address included in email footer
- [ ] Spam rate below 0.10% in Postmaster Tools
- [ ] Inactive subscribers removed or suppressed
- [ ] Sending volume increasing gradually (not spiking)
- [ ] “From” name and address consistent and recognizable
Take Action Before Your Next Campaign
Gmail’s sender requirements are not going away — and they are likely to become stricter over time. The good news is that the steps above are a one-time setup for most small businesses. Once your SPF, DKIM, and DMARC records are in place and your unsubscribe process is working, ongoing maintenance is mostly about monitoring your spam rate and keeping your list clean.
If you are unsure where to start, check your email service provider’s domain authentication guide — most platforms have step-by-step instructions tailored to their system. And if you want to go deeper on email strategy for northern and remote markets, explore the resources at ArcticMarketer.com for practical guides built around the realities of marketing in the North.
ArcticMarketer.com helps northern and remote businesses build effective digital marketing programs that work in real-world conditions.
