Improve Inbox Placement With Stronger Authentication
Monitor SPF, DKIM, and DMARC, protect sender reputation, and send from multiple accounts with round-robin and personalization — for permission-based, legitimate mail. Outcomes depend on your lists, content, and provider policies, not DNS alone.
From domain check to your first send in 3 steps
From domain check to delivered campaign — no technical expertise required.
Upload Your Contacts
Import contacts you have the right to mail (opt-in or otherwise compliant with your use case) via CSV or paste. Celeric reads first name, last name, and email so every message feels personal.
Write & Personalize
Use {{first_name}} and {{last_name}} variables in your subject and body. Send yourself a test email before launching the campaign.
Send with Round-Robin
Connect multiple SMTP accounts and Celeric distributes your contacts automatically across them — within each provider's sending limits and policies — to balance load and protect reputation.
Bad Authentication Kills Inbox Deliverability
Many tools skip ongoing authentication checks. Celeric monitors SPF, DKIM, and DMARC so you catch misconfigurations before you send — strengthening authentication signals that providers use alongside content, engagement, and reputation.
SPF
SPF tells receiving mail servers which IP addresses are authorized to send mail on behalf of your domain — without it, your messages look suspicious before they're even opened.
DKIM
DKIM cryptographically signs outgoing mail so inbox providers can verify the message hasn't been tampered with in transit — a key signal that separates legitimate senders from spammers.
DMARC
DMARC ties SPF and DKIM together and tells Gmail, Yahoo, and Outlook what to do when authentication fails — increasingly expected for bulk and high-volume legitimate senders.
Is your domain ready to send authenticated mail?
Check your SPF, DKIM, and DMARC records in seconds — free, no signup required.
Checks SPF, DKIM, DMARC, MX, blacklists & DNS.
Everything in One Place
Celeric combines email campaign tools with deliverability monitoring so you always know whether SPF, DKIM, and DMARC still protect your inbox placement.
Multi-SMTP Accounts
Connect multiple sending accounts to balance load across mailboxes — within each provider's sending limits and acceptable use policies.
Round-Robin Sending
Celeric automatically distributes contacts across your SMTP accounts — no manual splitting. Stays within the limits and policies of each connected provider.
CSV Contact Upload
Import contacts from any CSV — people you've obtained permission to email or may lawfully contact for your campaign. First name, last name, and email columns are automatically detected.
Personalization Variables
Use {{first_name}} and {{last_name}} to make every message feel one-to-one.
DMARC Monitoring
With monitoring enabled, scheduled checks keep SPF, DKIM, and DMARC on your radar — weekly on Free, daily on Pro, hourly on Business and Agency.
Email & Slack alerts
Get notified when a monitored domain's compliance score changes — email on Pro; Slack and webhooks on higher tiers.
Monitor deliverability, then send with confidence
Multi-SMTP round-robin (within provider limits), personalization, and DMARC monitoring — all in one platform. Start for free, no credit card required.
Free plan available • No credit card required • Paid plans from $29/mo