Email marketers invest heavily in list growth, creative design, and segmentation. Yet deliverability—the ability to land in the inbox—depends on factors that disposable addresses undermine. When your list contains addresses from temporary and throwaway domains, you face higher bounce rates, increased spam complaints, and damage to your sender reputation. Internet service providers (ISPs) and mailbox providers track engagement and complaint signals. High bounce rates and low engagement from disposable domains signal that your list is poorly maintained, which can trigger filtering or blocking. The result: even legitimate subscribers receive your emails less reliably.
Disposable emails also skew your metrics. Opens and clicks from throwaway addresses inflate engagement numbers without representing real customers. Worse, many disposable domains are short-lived; addresses expire within hours or days. Sending to them wastes resources and increases the likelihood of hard bounces. List hygiene—removing or segmenting disposables before you send—is a best practice for any serious email program.
Emailyze lets you verify your list before campaigns. By checking each address against a database of 30,000+ disposable and temporary domains, you can identify high-risk entries and either remove them or segment them for separate treatment. The workflow is simple: upload a CSV or send addresses via the batch API, receive flags for each entry, then clean your list based on the results. Verification adds a single step before send; the payoff is improved deliverability, cleaner metrics, and a healthier sender reputation.
Two primary workflows support different team sizes and technical setups.
CSV upload — For marketing ops teams without developers, the dashboard CSV upload feature is ideal. Upload a file containing email addresses (and optional metadata). The system processes the list in the background, checks each address, and returns a downloadable result file with flags. You then filter or remove disposables in your ESP or CRM before sending. See the [CSV bulk guide](/guides/csv-bulk) for the full workflow.
Batch API — For automated pipelines or integrations with your ESP, use the batch endpoint. Send up to 1,000 emails per request:
curl -X POST -H "X-API-Key: YOUR_API_KEY" -H "Content-Type: application/json" \
-d '{"emails": ["user1@tempmail.com", "user2@gmail.com", "user3@guerrillamail.com"]}' \
"https://api.emailyze.xyz/v1/check/batch/"The response includes results for each email with is_disposable, provider_type, and other signals. Chunk larger lists into batches of 1,000 and process sequentially or in parallel.
The batch endpoint is designed for bulk verification. Request format:
{
"emails": ["email1@domain.com", "email2@domain.com", ...]
}Maximum 1,000 emails per request. Response format:
{
"results": [
{
"email": "user1@tempmail.com",
"domain": "tempmail.com",
"is_disposable": true,
"provider_type": "disposable",
"mx_valid": true
},
{
"email": "user2@gmail.com",
"domain": "gmail.com",
"is_disposable": false,
"provider_type": "freemail",
"mx_valid": true
}
]
}Use is_disposable to filter out throwaway addresses. The provider_type field helps you segment: for example, you might treat freemail (Gmail, Yahoo, etc.) differently from personal (corporate) domains. mx_valid indicates whether the domain has valid mail exchange records—useful for catching typos and dead domains.
disposable, personal, freemail, masked, or unknown. Enables segmentation beyond a simple binary flag.Combining these signals lets you build nuanced policies: remove disposables entirely, segment freemail for different content, or flag masked addresses (e.g., Apple Hide My Email) for optional suppression depending on your use case.
ISPs and mailbox providers use engagement and complaint data to build sender reputations. When a high percentage of your recipients never open, click, or engage—or worse, mark your messages as spam—your reputation suffers. Disposable addresses contribute disproportionately to this problem. Recipients of throwaway emails rarely care about marketing; they signed up for a one-time purpose. Sending to them increases the likelihood of spam complaints and decreases engagement rates. Over time, poor list quality can lead to throttling or blocking. Cleaning your list before each major campaign, or at least before high-volume sends, is a proven way to maintain and improve deliverability.
Many email service providers support webhooks or APIs for list enrichment. You can build a sync job that exports new or updated contacts, sends them to the Emailyze batch API in chunks of 1,000, and writes the results back to custom fields (e.g., is_disposable, risk_score). Use those fields for segmentation: exclude disposables from campaigns, or send them to a separate "verify your email" flow. For teams using Zapier, Make, or similar tools, the REST API can be called from workflows triggered by new signups or list updates.
The provider_type field includes masked, which covers privacy-focused services like Apple Hide My Email and Firefox Relay. These are not disposable in the traditional sense—they forward to real inboxes—but some marketers prefer to treat them differently. If your audience skews privacy-conscious, consider allowing masked addresses while still blocking classic disposables. The API gives you the data; you choose the policy that fits your brand and compliance requirements. Run a test campaign on a small segment first to validate your deliverability gains before rolling out list cleaning across your entire database. Track open rates, bounce rates, and spam complaints before and after cleaning to quantify the impact. Many teams see a measurable improvement within one to two campaign cycles. Re-verify lists periodically; new disposable domains emerge regularly, and Emailyze's database is updated hourly to maintain coverage. Combine with other list hygiene steps—remove hard bounces, suppress unsubscribes—for a comprehensive deliverability strategy.
Improve deliverability and protect your sender reputation. Use the [CSV bulk guide](/guides/csv-bulk) for manual list cleaning, or integrate the [batch API](/docs/batch) into your ESP or marketing automation platform. Verify before you send—your inbox placement rates will thank you.