According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), MailUp is the email service provider (ESP) for 1,477 domains — 0.24% of 617,702 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
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.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 1 | 0.1% |
| Top 10,000 | 11 | 0.7% |
| Top 100,000 | 151 | 10.2% |
| Top 1,000,000 | 1,175 | 79.6% |
| Unranked | 139 | 9.4% |
| TLD | Domains | Share | |
|---|---|---|---|
| .it | 808 | 54.7% | |
| .com | 389 | 26.3% | |
| .net | 36 | 2.4% | |
| .cl | 33 | 2.2% | |
| .com.ar | 32 | 2.2% | |
| .org | 25 | 1.7% | |
| .uy | 18 | 1.2% | |
| .ar | 13 | 0.9% | |
| .co | 12 | 0.8% | |
| .com.mx | 12 | 0.8% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 1,477 domains.
| Type | Service | Domains | Share of MailUp users |
|---|---|---|---|
| Mailbox | Microsoft 365 | 493 | 33.4% |
| Mailbox | Google Workspace | 350 | 23.7% |
| Mailbox | Self-Hosted | 261 | 17.7% |
| Mailbox | Unknown / Other | 126 | 8.5% |
| Mailbox | Generic / unmatched (mx*.*) | 51 | 3.5% |
| Mailbox | Proofpoint | 35 | 2.4% |
| ESP | Amazon SES | 165 | 11.2% |
| ESP | Zendesk | 104 | 7.0% |
| ESP | Mandrill | 75 | 5.1% |
| ESP | SendGrid (Twilio) | 73 | 4.9% |
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) →
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.
1,477 domains in the Tranco top-1M use MailUp as their email service provider (ESP) as of July 13, 2026 (0.24% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
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.
MailUp's largest TLD is .it (54.7% of its domains); it appears across 47 TLDs in total.