MailUp email service provider (ESP)
According to Live Direct Marketing's daily Tranco top-1M scan (September 14, 2026), MailUp is the email service provider (ESP) for 1,510 domains — 0.24% of 637,677 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Key facts
- 1,510 domains in the Tranco top-1M use MailUp (0.24% of SPF-publishing domains).
- Snapshot date: 2026-09-14 — recomputed every day.
- Strongest TLD: .it (53.7% of its domains).
- Most co-used service: Microsoft 365.
- Directory category: email service provider.
Why MailUp appears in this category
Italian marketing automation, enterprise B2C.
We classify it as a email service provider from include: mechanisms in the SPF record matching a maintained provider rule. This is infrastructure attribution from public DNS, not evidence of a direct contract or exclusive use.
MailUp is an Italian email service platform operated by MailUp S.p.A., headquartered in Cremona. It provides email marketing, SMS, and push notification infrastructure primarily to small and mid-sized businesses across Europe, with particular concentration in Italy and the broader EMEA region.
For deliverability teams, MailUp's presence surfaces in SPF records of smaller European sites, often coexisting with Microsoft 365 deployments in the same organisation. This footprint matters when testing email reception and authentication across the long tail of smaller European recipient domains: you may encounter both MailUp's sending infrastructure and Microsoft's cloud services within a single recipient environment, which can affect how DMARC alignment and SPF validation behave.
Where MailUp sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 1 | 0.1% |
| Top 10,000 | 10 | 0.7% |
| Top 100,000 | 160 | 10.6% |
| Top 1,000,000 | 1,324 | 87.7% |
| Unranked | 15 | 1.0% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .it | 811 | 53.7% | |
| .com | 408 | 27.0% | |
| .cl | 37 | 2.5% | |
| .net | 36 | 2.4% | |
| .com.ar | 29 | 1.9% | |
| .org | 23 | 1.5% | |
| .uy | 16 | 1.1% | |
| .ar | 14 | 0.9% | |
| .co | 13 | 0.9% | |
| .com.mx | 12 | 0.8% |
What MailUp users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 1,510 domains.
| Type | Service | Domains | Share of MailUp users |
|---|---|---|---|
| Mailbox | Microsoft 365 | 492 | 32.6% |
| Mailbox | Google Workspace | 351 | 23.2% |
| Mailbox | Self-Hosted | 271 | 17.9% |
| Mailbox | Unknown / Other | 130 | 8.6% |
| Mailbox | Generic / unmatched (mx*.*) | 52 | 3.4% |
| Mailbox | Proofpoint | 36 | 2.4% |
| ESP | Amazon SES | 173 | 11.5% |
| ESP | Zendesk | 108 | 7.2% |
| ESP | Mandrill | 79 | 5.2% |
| ESP | SendGrid (Twilio) | 77 | 5.1% |
SPF and DMARC alignment with MailUp's shared sending infrastructure
MailUp customers authorise the platform's sending by adding SPF include mechanisms to their domain's record, and the platform signs outbound mail with its own DKIM keys. When a recipient enforces strict DMARC policies, misalignment between the sender's mail-from domain and MailUp's signing identity can trigger rejection or quarantine. Before deploying mail through MailUp, verify that your SPF includes are correct and that your DMARC policy permits relaxed or simple DKIM alignment; stricter policies may require additional configuration coordination with MailUp's infrastructure team.
See the full MailUp data page (KPI cards, trend, sample domains) →
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Frequently asked questions
Should I test email deliverability against MailUp-using recipient domains?
Yes, if your audience includes European SMBs, startups, or Italian organisations — MailUp's concentration in that segment means testing authentication and inbox placement against MailUp-using recipients is prudent. You need only add MailUp-specific testing if those verticals represent a material portion of your recipient base.
How many domains use MailUp?
1,510 domains in the Tranco top-1M use MailUp as their email service provider (ESP) as of September 14, 2026 (0.24% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Is MailUp common enough to affect email deliverability testing?
MailUp accounts for 0.24% of SPF-publishing domains in the top 1M. Whether you should seed a test mailbox there depends on how much of your audience it represents — the co-usage table above shows the services it appears alongside most.
Which countries or TLDs use MailUp most?
MailUp's largest TLD is .it (53.7% of its domains); it appears across 49 TLDs in total.