VeriMails vs Mails.so
Mails.so is a simple email validation service with a hosted UI, API, list validation, batch validation, integrations, and subscription plans. VeriMails is built around transparent non-expiring verification credits for bulk CSV cleanup, API checks, and catch-all risk segmentation.
Updated May 20, 2026
At a Glance
| Decision point | VeriMails | Mails.so |
|---|---|---|
| Best fit | One-time or repeat verification jobs with non-expiring credits | Subscription-style validation with API access, list validation, and no-code integrations |
| Entry offer | 100 free credits, no credit card required | 50 free credits advertised on the homepage |
| 10,000 email cost | $19 one-time credit pack | Pro plan includes 10,000 validations/month; pricing shows EUR 48/month before first-month promotion |
| Billing model | Buy fixed credit packs; credits never expire | Monthly subscription plans with included monthly validations and extra-validation pricing |
| API | REST verification API for real-time and bulk workflows | GET /v1/validate, POST /v1/batch, and GET /v1/batch/{id} |
| Batch validation | Bulk CSV verification and downloadable results | Async batch API with a job ID and separate result retrieval endpoint |
| Catch-all handling | Catch-all flag for segmentation | Docs show catch-all as a risky result with reason set to catch_all and isv_nocatchall set to false |
| Unlimited plan | Buy larger fixed credit packs when needed | Pricing includes an Unlimited subscription tier |
Our marketing team used to blame sales for bad leads. Turned out 18% of our lead database had invalid emails. VeriMails fixed the data, fixed the argument.Richard T. — VP Marketing at Mid-Market Software Company, United States
Mails.so Pricing and API Notes
Mails.so presents itself as a simple validation service with both UI and API workflows. Its homepage advertises 50 free credits, API access on paid plans, list validation, GDPR compliance, and a pricing section that can render promotional first-month discounts. The product is therefore a subscription-style comparison, not the same buying model as VeriMails credit packs.
Pricing Snapshot
Mails.so pricing currently renders as subscription plans, and the homepage may show discounted first-month prices. Use the plan allowances and extra-validation rows to avoid mistaking a monthly subscription for a one-time credit pack.
| Plan or pack | VeriMails | Mails.so pricing model |
|---|---|---|
| Free start | 100 free credits | 50 free credits |
| 10,000 monthly validations | One-time 10,000-credit pack available for $19 | Pro plan shows EUR 48/month regular price, includes 10,000 validations/month, and lists EUR 0.005 per extra validation |
| 50,000 monthly validations | $59 for 50,000 non-expiring credits | Business plan shows EUR 98/month regular price, includes 50,000 validations/month, and lists EUR 0.002 per extra validation |
| Unlimited-style usage | Use larger published credit packs as needed | Unlimited plan shows EUR 498/month regular price; confirm current checkout and usage terms |
| Enterprise | Published packs up to 1,000,000 credits | Enterprise plan appears at $1,899/month with priority support and SLA language |
Mails.so prices can render with local currency and temporary first-month discounts. The comparison avoids converting euro-denominated plan prices into dollars because checkout currency and discounts may vary.
VeriMails credit pricing
| Credits | VeriMails price | Price per email |
|---|---|---|
| 10,000 | $19 | $0.0019 |
| 25,000 | $39 | $0.00156 |
| 50,000 | $59 | $0.00118 |
| 100,000 | $99 | $0.00099 |
| 250,000 | $199 | $0.000796 |
| 500,000 | $349 | $0.000698 |
| 1,000,000 | $499 | $0.000499 |
| 2,500,000 | $999 | $0.0004 |
| 5,000,000 | $1,499 | $0.0003 |
Email Finder costs 20 credits only when VeriMails returns a verified person-level email. At the 10,000-credit pack, that is $0.038 per found email. Monthly plans start at $12.50/mo when billed yearly.
API and Batch Validation
Mails.so documents a straightforward API. The single validation endpoint uses GET /v1/validate?email=. The batch endpoint uses POST /v1/batch with an array of emails, returns a batch ID, and then results are retrieved with GET /v1/batch/{id}. That async design is useful when the input list is larger than a single form check.
| Developer question | VeriMails | Mails.so |
|---|---|---|
| Single validation | REST verification API | GET /v1/validate |
| Batch validation | Bulk CSV and API workflows | POST /v1/batch starts an async batch |
| Batch results | Downloadable results and API workflow | GET /v1/batch/{id} retrieves completed results |
| Response wrapper | JSON verification result | Docs show data and error top-level fields |
| Result fields | Deliverability and risk signals | Docs include score, result, reason, disposable, free, role, and catch-all related fields |
Catch-all and Risk Handling
Mails.so's single-validation docs show a catch-all example classified as risky, with reason set to catch_all and isv_nocatchall set to false. Its batch docs also show examples such as deliverable and unknown results. That is the right operational posture: catch-all addresses should not be treated the same as clean valid mailboxes.
VeriMails also makes catch-all a separate segmentation signal. The practical difference is buying model and workflow fit, not whether catch-all deserves a cautious bucket.
Who Should Choose Which?
Choose VeriMails if
You want a verification-first product with non-expiring credits, one-time credit packs, bulk CSV cleanup, API verification, and clear catch-all segmentation without committing to a monthly validation allowance.
Choose Mails.so if
You prefer a monthly subscription, want its simple hosted UI and docs, need included recurring validation volume, or value the Unlimited plan structure for ongoing API/list validation usage.
Run the Next Check in VeriMails
Run a small sample through VeriMails and inspect valid, invalid, catch-all, disposable, role-based, and unknown results before sending to the full list.
Verification Accuracy
Both VeriMails and Mails.so can help reduce bad addresses before a campaign. The difference is how clearly the result fits your next send: VeriMails keeps valid, invalid, disposable, role-based, catch-all, and unknown rows separate for decision-making.
Use a recent sample from your own CRM, not a perfect test list. The addresses that matter are the ones you plan to mail this week: old leads, imported contacts, role inboxes, catch-all domains, and records from mixed sources.
Who VeriMails Is Best For
Choose VeriMails when verification is the job and you want the result before the send.
- You already have a list and need to clean it before a campaign.
- You want prepaid verification credits that never expire.
- You need API and CSV verification without paying for a larger sales platform.
Source Checks Before You Buy
Mails.so shows plan prices, promotions, and currency presentation on its homepage pricing section. Check the live plan section and API docs before you buy, then compare the same validation volume against VeriMails one-time credit packs.
Frequently Asked Questions
Related Comparisons
We tested VeriMails against Mailsso on 8K contacts before moving the campaign. VeriMails flagged 640 bad addresses, catch-all detection was clearer, and the export was ready for sales the same afternoon.Mina A. — Revenue Operations Lead at Mailsso Migration Project, France
Try VeriMails Free
100 free credits. No credit card required. Verify a real sample before sending your next list.
Start Free