ImprovMX (forwarding) mailbox provider
According to Live Direct Marketing's daily Tranco top-1M scan (September 11, 2026), ImprovMX (forwarding) is the mailbox provider for 768 domains — 0.12% of 666,213 domains with MX records. Detection method: primary MX record (lowest preference).
Key facts
- 768 domains in the Tranco top-1M use ImprovMX (forwarding) (0.12% of domains with MX records).
- Snapshot date: 2026-09-11 — recomputed every day.
- Strongest TLD: .com (49.9% of its domains).
- Region skew: Global / US-skewed.
- Most co-used service: ImprovMX.
- Directory category: email forwarding service.
Why ImprovMX (forwarding) appears in this category
US email forwarding with web UI.
We classify it as a email forwarding service from primary MX record (lowest preference) matching a maintained provider rule. This is infrastructure attribution from public DNS, not evidence of a direct contract or exclusive use.
ImprovMX is an email forwarding service operated by the ImprovMX team that enables domain owners to receive mail at their own domain whilst forwarding messages to existing mailboxes—typically Gmail, Outlook, or corporate mail systems. The service functions by becoming the primary MX record for a domain, intercepting inbound messages and relaying them to the destination address the owner specifies.
Its footprint is concentrated in the long tail of smaller sites and .com domains, with a predominantly global but US-centric distribution. For senders and deliverability professionals, this pattern is informative: ImprovMX records indicate you are communicating with a smaller or non-enterprise entity relying on commodity email providers rather than dedicated mail infrastructure. This has tangible implications for authentication alignment, spam filter treatment, and understanding the delivery path of your outbound messages.
Where ImprovMX (forwarding) sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 6 | 0.8% |
| Top 100,000 | 58 | 7.6% |
| Top 1,000,000 | 693 | 90.2% |
| Unranked | 11 | 1.4% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 383 | 49.9% | |
| .net | 51 | 6.6% | |
| .org | 49 | 6.4% | |
| .io | 13 | 1.7% | |
| .app | 12 | 1.6% | |
| .co | 11 | 1.4% | |
| .ir | 10 | 1.3% | |
| .ru | 9 | 1.2% | |
| .in | 8 | 1.0% | |
| .de | 8 | 1.0% |
What ImprovMX (forwarding) users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 768 domains.
| Type | Service | Domains | Share of ImprovMX (forwarding) users |
|---|---|---|---|
| ESP | ImprovMX | 663 | 86.3% |
| ESP | Amazon SES | 41 | 5.3% |
| ESP | Mailgun | 34 | 4.4% |
| ESP | Mailjet (Sinch) | 23 | 3.0% |
| ESP | Zendesk | 20 | 2.6% |
| ESP | Namecheap Forwarding | 18 | 2.3% |
| ESP | SendGrid (Twilio) | 17 | 2.2% |
| ESP | SMTP.com | 13 | 1.7% |
| ESP | SparkPost | 10 | 1.3% |
| ESP | Brevo (ex-Sendinblue) | 10 | 1.3% |
Authentication complexity in forwarded delivery
When a message passes through ImprovMX, it traverses an additional hop before final delivery, which complicates sender authentication evaluation. SPF, DKIM, and DMARC checks depend on whether ImprovMX is properly authorised in the original domain's SPF record and how it handles DKIM re-signing during the forwarding process. Misalignment between the domain and ImprovMX's infrastructure can cause authentication failures; some receiving systems also apply stricter scrutiny to forwarded mail, making correct SPF configuration and DKIM alignment particularly important for domains that rely on this forwarding service.
See the full ImprovMX (forwarding) data page (KPI cards, trend, sample domains) →
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Frequently asked questions
Will email reach the inbox when sent to a domain using ImprovMX?
Yes, messages sent to an ImprovMX-forwarded domain will be accepted and forwarded to the specified destination, but the additional forwarding hop means your message passes through ImprovMX's systems and may face stricter filtering at the destination; deliverability ultimately depends on your sender reputation and the final recipient's mailbox provider policies.
How many domains use ImprovMX (forwarding)?
768 domains in the Tranco top-1M use ImprovMX (forwarding) as their mailbox provider as of September 11, 2026 (0.12% of domains with MX records), according to Live Direct Marketing's daily DNS scan.
Is ImprovMX (forwarding) common enough to affect email deliverability testing?
ImprovMX (forwarding) accounts for 0.12% of domains with MX records 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 ImprovMX (forwarding) most?
ImprovMX (forwarding)'s largest TLD is .com (49.9% of its domains); it appears across 122 TLDs in total.