According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), Symantec MTA Routes is the email service provider (ESP) for 200 domains — 0.03% of 617,702 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Symantec MTA Routes is an email routing service operated by Symantec that organisations include in their SPF records to authorise outbound mail transmission. It provides message transfer agent routing infrastructure, allowing customers to delegate mail relay to Symantec's platform rather than operating their own mail servers.
In the wild, Symantec MTA Routes appears predominantly in the SPF configuration of smaller and mid-market organisations across many geographic regions and top-level domains, with particular concentration in .com. For senders using Symantec MTA Routes, this means sharing infrastructure and reputation with a diverse set of peer organisations; for mail receivers, encountering Symantec MTA Routes in an SPF record typically signals an organisation of modest scale rather than an enterprise with dedicated mail infrastructure.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 0 | 0.0% |
| Top 100,000 | 4 | 2.0% |
| Top 1,000,000 | 161 | 80.5% |
| Unranked | 35 | 17.5% |
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 77 | 38.5% | |
| .org | 27 | 13.5% | |
| .co.uk | 21 | 10.5% | |
| .nl | 20 | 10.0% | |
| .com.au | 9 | 4.5% | |
| .net | 5 | 2.5% | |
| .co.za | 4 | 2.0% | |
| .org.uk | 3 | 1.5% | |
| .co.nz | 3 | 1.5% | |
| .au | 3 | 1.5% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 200 domains.
| Type | Service | Domains | Share of Symantec MTA Routes users |
|---|---|---|---|
| Mailbox | MTA Routes | 106 | 53.0% |
| Mailbox | Microsoft 365 | 57 | 28.5% |
| Mailbox | Unknown / Other | 10 | 5.0% |
| Mailbox | SpamExperts (AntiSpamCloud) | 5 | 2.5% |
| Mailbox | Google Workspace | 4 | 2.0% |
| Mailbox | Mimecast | 4 | 2.0% |
| ESP | Mandrill | 25 | 12.5% |
| ESP | SendGrid (Twilio) | 24 | 12.0% |
| ESP | Mailchimp | 23 | 11.5% |
| ESP | Mailgun | 17 | 8.5% |
Because Symantec MTA Routes serves a broad and heterogeneous base of smaller senders, any individual organisation using the service inherits reputation consequences from the collective behaviour of all senders on its shared IP address ranges. Receiving mail systems will validate SPF records that include Symantec MTA Routes by checking the published IP ranges, but a sender's actual inbox placement depends not only on passing SPF, but also on how the broader sender community using those IPs behaves—making it essential for senders to maintain strong authentication through DKIM and DMARC, and high engagement metrics, even when routing through a third-party platform.
See the full Symantec MTA Routes data page (KPI cards, trend, sample domains) →
Yes, you should include the appropriate Symantec MTA Routes include directive in your SPF record to authorise mail sent through their platform, but verify that you actually use them and avoid creating an excessively long SPF record, which can cause validation failures.
200 domains in the Tranco top-1M use Symantec MTA Routes as their email service provider (ESP) as of July 13, 2026 (0.03% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Symantec MTA Routes accounts for 0.03% 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.
Symantec MTA Routes's largest TLD is .com (38.5% of its domains); it appears across 33 TLDs in total.