Bulk email service that respects your domains
Cllavio is a bulk email service for teams that send serious volume: product launches, big promos, announcements to hundreds of thousands of contacts. You get a clean UI, a simple API, and safeguards that keep your domains usable long-term.
This page is for bulk campaigns to your existing list. If you're doing cold outbound, see Cold Email Sending instead.
Bulk email is where most platforms quietly punish you. Pricing jumps as you cross arbitrary thresholds, dashboards slow down on large sends, and you get vague advice when deliverability drops right before a critical campaign.
Cllavio takes a different approach. We assume you'll send big campaigns regularly, and we build everything around inbox placement, clean list handling, and predictable volume-based pricing. You can send to 10,000 or 500,000+ contacts with the same workflow, instead of stitching together separate tools or negotiating enterprise contracts.
You get campaigns and an Email API in the same product, so your team doesn't maintain two providers or reconcile two sets of metrics.
When does a bulk email service make sense?
You send large, time-sensitive campaigns
You're announcing product launches, seasonal sales, or company-wide updates to a list that's measured in tens or hundreds of thousands. The send must finish on time, land in the inbox, and give you clear stats fast.
- Newsletters to a large, engaged list
- Big promotional blasts (Black Friday, new collection, etc.)
- Important announcements to all users or customers
You want scale without burning domains
Anyone can push a button and send a million emails. The hard part is doing it without cooking your domains and IPs. Cllavio bakes in warmup, list hygiene, and bounce monitoring so you don't win one campaign and lose the next ten.
- New domains that need gradual warmup
- Older lists that need cleaning before large sends
- Brands that send frequently and can't afford a block
How bulk sending works in Cllavio
Cllavio keeps the workflow straightforward: import your audience, build a campaign, choose volume and schedule, and let the system handle the mechanics of delivery, throttling, and monitoring.
- Import and clean your list. Upload CSV files with Cllavio's CSV import or connect existing systems. We skip invalid addresses, respect global unsubscribes, and help you identify risky segments before you send a large blast.
- Authenticate your domain. You add SPF, DKIM, and DMARC records in your DNS; we verify them and confirm that your bulk sends will be properly authenticated so mailbox providers know who's talking.
- Create and schedule campaigns. Build newsletters, announcements, and promo campaigns with a simple editor. Set send time, audience, and any basic segmentation (country, status, tags) without touching code.
- Send at volume with guardrails. When a campaign goes live, Cllavio streams messages through a warm, monitored infrastructure. If bounce or complaint rates spike mid-send, we slow or pause to protect your reputation.
- Review real-time analytics. Watch opens, clicks, bounces, spam, and delivery over time. You can spot issues at specific ISPs, compare campaigns, and decide what to send next based on how real users behave.
Inbox-first defaults, not vanity send counts
Bulk email that doesn't land in the inbox is just stress on your infrastructure. Cllavio's bulk email service is built around the boring fundamentals that actually move the needle: healthy lists, aligned authentication, reasonable send patterns, and honest feedback when something's off.
Our platform monitors every high-volume send for bounce rate and spam signals. If a campaign is clearly hurting your reputation, Cllavio will surface that immediately and can pause sending instead of pushing everything out just to report a nice “sent” number.
- SPF, DKIM, and DMARC checks as first-class configuration.
- Hard bounce and complaint monitoring with clear thresholds and explanations.
- Guidance for warming up new domains and IPs instead of blasting from day one.
- Protection from obviously dangerous behavior, like repeatedly sending to the same invalid or unengaged addresses.
Volume-based plans without games
Most teams that care about bulk sending want one thing from pricing: predictability. You should know how many emails you can send this month and what it will cost, without diving into a maze of add-ons and upsells.
Cllavio's plans are built around emails per month and contacts in your list. You choose a tier that matches your current scale, send as much as you need inside that tier, and only upgrade when your volume consistently justifies it.
- Generous free and starter tiers for smaller lists.
- Growth tiers for brands sending regular campaigns to large audiences.
- Higher-volume options for teams that send millions of emails per month.
For current tiers and limits, see the Cllavio pricing page. If you're planning a very large send (e.g. a once-a-year mega campaign), you can also contact support to make sure the infrastructure is prepared.
Why teams switch their bulk email to Cllavio
From bloated all-in-one tools
Many teams move to Cllavio after realizing they're paying for marketing suites packed with features they never use: landing pages, CRMs, chat widgets, and half-built workflow builders.
- Faster dashboards focused on email only.
- Cleaner UI for building and sending big campaigns.
- Less time wasted digging through menus for basic deliverability settings.
From developer-only email APIs
Other teams start on an email API meant primarily for transactional traffic and then realize their marketing team has no good place to run large, branded campaigns.
- Marketers get a campaign UI; developers keep a clean API and SMTP relay.
- Shared infrastructure and analytics across both worlds.
- No more juggling two separate providers and reputations.
Start your next bulk send on Cllavio
If you're planning a large campaign in the next few days or weeks, you can do a test send on Cllavio first: connect your domain, import a segment of engaged subscribers, and send a smaller version of your campaign. Watch how inbox placement and engagement look before you move everything over.
Questions about migration, warmup, or edge cases? Email support@cllavio.com with your current volume and timeline, and we'll help you map out a safe plan.