How I Would Fix emails landing in spam in a Circle and ConvertKit founder landing page Using Launch Ready.

How I Would Fix emails landing in spam in a Circle and ConvertKit founder landing page Using Launch Ready

The symptom is usually simple: a founder sends a welcome email, waitlist invite, or launch update from ConvertKit, and too many people never see it in the inbox. It lands in spam, promotions, or gets silently throttled by the mailbox provider.

The most likely root cause is not "email copy" first. It is usually domain authentication or domain reputation: SPF, DKIM, DMARC, sending alignment, bad redirects, a misconfigured subdomain, or a new domain with no trust history. The first thing I would inspect is the sending domain setup inside ConvertKit plus the DNS zone in Cloudflare, because if authentication is broken there, everything else is downstream damage.

Triage in the First Hour

1. Check the exact sending domain in ConvertKit.

• Confirm whether emails are sent from the root domain or a subdomain.
• Look for any warning banners about authentication, deliverability, or sender verification.

2. Open Cloudflare DNS and inspect all email-related records.

• SPF TXT record
• DKIM CNAME or TXT records
• DMARC TXT record
• MX records if the domain also receives mail
• Any conflicting TXT records on the same host

3. Review Circle and ConvertKit integration points.

• Confirm which system triggers the email.
• Check whether Circle is using an embedded form, webhook, automation, or redirect to ConvertKit.
• Make sure no one duplicated signup flows and caused double sends.

4. Test the live signup flow end to end.

• Submit the founder landing page form with a real Gmail and Outlook address.
• Watch whether the confirmation email arrives within 1 to 3 minutes.
• Check inbox, spam, promotions, and quarantine.

5. Inspect recent deployment changes.

• New domain?
• New subdomain?
• Changed Cloudflare proxy settings?
• Added redirects?
• Updated form action URLs?
• Modified environment variables?

6. Check mailbox provider signals if available.

• Google Postmaster Tools
• Microsoft SNDS
• Any bounce or complaint reports in ConvertKit

7. Review recent content patterns.

• Heavy link use
• URL shorteners
• Spammy subject lines
• Missing unsubscribe link
• Poor text-to-image balance

8. Verify SSL and canonical routing on the landing page.

• The site should resolve consistently on one canonical host.
• No mixed content.
• No redirect chains that confuse crawlers or users.

dig txt yourdomain.com
dig txt _dmarc.yourdomain.com
dig txt selector1._domainkey.yourdomain.com

Root Causes

| Likely cause | What it looks like | How I confirm it | |---|---|---| | SPF missing or wrong | Mail authenticated by some providers but rejected by others | Compare DNS TXT record against ConvertKit docs and test headers | | DKIM not enabled | Messages arrive but fail trust checks | Inspect raw email headers for `dkim=fail` or missing signature | | DMARC too strict too early | Legit mail gets rejected or quarantined | Check DMARC policy and alignment results | | Sending from a fresh domain | Low trust score and high spam placement | Review domain age, volume spikes, and mailbox reputation tools | | Broken redirects or subdomains | Users sign up on one host but mail comes from another identity | Audit Cloudflare redirects and canonical URLs | | Duplicate automation paths | One signup triggers multiple emails fast enough to look suspicious | Trace Circle events and ConvertKit automations |

1. SPF misconfiguration

This happens when the DNS record does not include every authorized sender, or when there are multiple SPF records for one host. Mail providers see that as weak proof of identity.

I confirm it by checking the raw message headers and comparing them to what ConvertKit says should be published in DNS. If SPF fails while DKIM also fails or aligns poorly, spam placement becomes much more likely.

2. DKIM not signing correctly

DKIM proves the message was signed by your sending service. If it is missing, expired, or pointed at the wrong selector record, mailbox providers lose confidence fast.

I confirm this by opening a delivered message's full headers and looking for `dkim=pass`. If it says fail or none, I fix DNS first before touching anything else.

3. DMARC policy mismatch

DMARC tells inbox providers how to handle mail that fails SPF or DKIM. A strict policy without proper alignment can push legitimate mail into spam or reject it outright.

I confirm this by checking whether the From domain matches the authenticated domain used by ConvertKit. If they do not align, DMARC will punish you even if one of SPF or DKIM passes.

4. Domain reputation is too new

A brand new founder landing page often starts sending immediately after launch. That is risky because mailbox providers have little trust history for the domain.

I confirm this by checking domain age, sending volume spikes, complaint rate, bounce rate, and whether the first campaign went to a cold list with weak engagement.

5. Circle to ConvertKit handoff is messy

If Circle captures leads but ConvertKit sends emails through another path, you can create duplicates, delayed sends, missing tags, or inconsistent sender identities.

I confirm this by tracing one signup from form submit to tag assignment to automation trigger to actual send event.

6. Landing page routing is inconsistent

If Cloudflare proxies some hosts while others bypass SSL rules or redirect through multiple hops, you create trust problems for both users and filters.

I confirm this by testing `www`, apex domain, subdomains, and any tracking links for consistent HTTPS behavior and one canonical route.

The Fix Plan

My rule here is simple: fix identity first, then delivery hygiene, then content patterns. Do not keep changing copy while DNS is broken because that only hides the real issue.

1. Normalize the sending identity.

• Pick one sender address format.
• Use a branded sending subdomain if needed.
• Keep From name stable across all campaigns.

2. Repair DNS in Cloudflare.

• Publish exactly one SPF record for each host that sends mail.
• Add DKIM records exactly as provided by ConvertKit.
• Add a DMARC record with monitoring first if you are unsure about enforcement.
• Remove duplicate TXT records that conflict with each other.

3. Align Circle with ConvertKit intentionally.

• Make sure Circle signups map into one clean list segment or automation path.
• Prevent double opt-ins from two systems fighting each other unless you explicitly want that behavior.
• Test tags and sequences after every signup event.

4. Clean up redirects and canonical hosts.

• Force one HTTPS version of the site.
• Remove redirect chains longer than one hop where possible.
• Make sure forms post to stable endpoints only.

5. Warm up safely if volume has been low.

• Send to engaged subscribers first.

Start with people who opened recently rather than blasting everyone at once. Increase volume over several days instead of one spike.

6. Tighten list hygiene inside ConvertKit. Remove hard bounces immediately. Suppress unengaged contacts after a reasonable period if deliverability keeps slipping. Avoid importing old scraped lists or stale leads into a fresh launch sequence.

7. Review security basics while you are there. Lock down DNS access with least privilege. Turn on Cloudflare protection features that do not break email routing. Store API keys only in environment variables or secret managers, never in front-end code.

A safe repair sequence looks like this:

1. Fix DNS auth records in Cloudflare 2. Verify headers on test messages 3. Confirm Circle signup flow into ConvertKit 4. Send internal test campaigns 5. Re-enable public launch sends 6. Monitor bounces and complaints for 24 to 48 hours

Regression Tests Before Redeploy

Before I call this fixed, I want evidence rather than hope.

• Send test emails to Gmail, Outlook.com, Yahoo Mail, and one corporate inbox if available.
• Confirm delivery time under 3 minutes for transactional-style welcome messages.
• Inspect raw headers for:
• `spf=pass`
• `dkim=pass`
• `dmarc=pass`
• Confirm only one canonical website host responds with HTTPS 200 after redirects are applied.
• Submit the founder landing page form from mobile Safari and Chrome on Android if possible.
• Verify no duplicate tags or duplicate welcome emails are triggered in ConvertKit after one signup.
• Check that unsubscribe links render correctly on mobile devices.
• Confirm image-heavy emails still load cleanly without broken assets or mixed-content warnings.

Acceptance criteria I would use:

• At least 90 percent of test messages land in inboxes across major providers during validation
• No authentication failures in message headers
• No duplicate automation runs per single signup
• No broken redirect loops
• No exposed API keys or secrets in source code
• No increase in bounce rate above 2 percent during verification sends

Prevention

If I am protecting this long term under a cyber security lens as well as deliverability hygiene, I put guardrails around identity and change control.

• Monitor SPF/DKIM/DMARC status weekly using automated checks
• Set alerts for bounce spikes above 3 percent and complaint spikes above 0.1 percent
• Keep Cloudflare DNS changes behind reviewed access only
• Document every sending domain and subdomain used by Circle and ConvertKit
• Use staged rollouts for new automations instead of flipping everything live at once
• Keep forms simple so users do not abandon before subscribing
• Run periodic deliverability tests before launches with at least 20 seed addresses

From a code review angle, I would also check:

• Form validation behavior
• Webhook retry logic
• Secret handling for API tokens
• Logging so sensitive data never appears in logs
• Rate limits on public forms to reduce abuse

From a UX angle:

• Make subscription confirmation obvious
• Show success states clearly after signup
• Tell users where to look if confirmation lands late
• Keep error states human-readable instead of technical

From a performance angle:

• Keep landing pages lightweight so users reach signup quickly
• Avoid loading unnecessary third-party scripts that slow form submission
• Optimize images so LCP stays under 2.5 seconds on mobile

When to Use Launch Ready

Use Launch Ready when you need me to fix this without turning it into a week-long guessing game.

• Domain setup review
• Email authentication repair: SPF/DKIM/DMARC
• Cloudflare configuration
• SSL checks
• Redirects and subdomains
• Production deployment sanity checks
• Environment variables and secrets review
• Uptime monitoring setup
• Handover checklist so your team knows what changed

This sprint fits best when:

• Your founder landing page is live but deliverability is broken
• You have a working prototype built in Circle plus ConvertKit but no senior-level infrastructure review yet
• You need fast correction before launch ads waste money driving leads into spam folders

What I need from you before I start: 1. Admin access to Cloudflare 2. Admin access to ConvertKit 3. Access to Circle settings relevant to forms and automations 4. Your current domain registrar login if DNS lives there instead of Cloudflare 5. A list of all sender addresses you use today 6. One example of an email that landed in spam

If you want me to treat this as production work instead of trial-and-error support tickets, book here: https://cal.com/cyprian-aarons/discovery

Delivery Map

References

1. Roadmap.sh API Security Best Practices: https://roadmap.sh/api-security-best-practices 2. Roadmap.sh Cyber Security: https://roadmap.sh/cyber-security 3. Roadmap.sh QA: https://roadmap.sh/qa 4. Google Workspace Admin Help on SPF/DKIM/DMARC: https://support.google.com/a/topic/2752442 5. ConvertKit Deliverability Help Center: https://help.convertkit.com/en/collections/2308410-deliverability

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Take the next step

If this is a problem in your product right now, here is what to do next:

• [Use the free Cyprian tools](/tools) - estimate cost, score app risk, check launch readiness, or pick the right service sprint.

• [Book a discovery call](/contact) - I will tell you honestly whether you need a sprint or if you can DIY the next step.

*Written by Cyprian Tinashe Aarons - senior full-stack and AI engineer helping founders rescue, launch, automate, and scale AI-built products.*