Edx uses Salesforce MC for marketing email and SparkPost for transactional/notifications. They rank #3,526 in the Tranco list of most-popular domains. Email goes out from 3 different subdomains. Their email authentication setup is solid (score 95/100).
Authentication signals observed in this brand's emails. SPF, DKIM and DMARC are the standard sender-authentication stack — see the DMARC policy below for whether spoofing is actually blocked or just monitored. One-click unsubscribe meets Google & Yahoo's bulk-sender requirements.
SPF / DKIM / DMARC above reflect the last 4 emails we've observed. DMARC policy is read live from DNS.
DMARC reports sent to Red Sift OnDMARC. Policy
p=quarantine means receivers actively block or quarantine spoofed mail.
SPF alignment: all 23 observed emails use a return-path aligned with edx.org (bounce.sfmc.edx.org, bounce.sfmc2.edx.org). SPF authenticates the visible From — supports DMARC directly.
DKIM alignment: all 17 observed emails sign with a domain aligned with edx.org (sfmc.edx.org, sfmc2.edx.org). DKIM authenticates the visible From — supports DMARC directly.
VMC issued by: digicert.
TLS: modern — 90% TLS 1.3 (across 10 sends).
Delivery: fast — 100% of emails in the last 7 days arrive in under 10 seconds (across 3 sends).
Brands often use multiple ESPs (e.g. one for marketing, another for transactional/notifications).
None — only the primary ESP(s) shown aboveESPs we've seen sending email for this brand. Green = confirmed by SPF, sender IP rDNS, or known infra pairing (label shows the source). Grey = observed but not yet confirmed by SPF or PTR.
ESPs this brand has authorized in their SPF record. We confirm them with a green ✓ only after seeing recurring use (3+ emails across 2+ days). Until then they stay here — either we haven't observed any email yet, or we've seen a handful but not enough to call them a regular sender for the brand.
Probed: edx.org, bounce.sfmc.edx.org, bounce.sfmc2.edx.org, sfmc.edx.org, news.edx.org, sfmc2.edx.org
Folder distribution across all emails from this brand observed in Gmail inboxes. High inbox % = good deliverability; spam appearances are the headline signal.
| Folder | Count | Share |
|---|---|---|
| inbox | 24 | 100.0% |
Which ESP's emails are landing where. Sorted by spam % so problem senders surface first. Brands using one ESP for marketing and another for transactional often see very different placement profiles per ESP. Per-ESP folder data only started being captured recently — counts here may be smaller than the total above until backfill catches up.
| ESP | Emails | Placement | Inbox % | Tabs % | Spam % |
|---|---|---|---|---|---|
| SparkPost | 1 | 100.0% | 0.0% | 0.0% | |
| Salesforce MC | 23 | 100.0% | 0.0% | 0.0% |
Daily observations per ESP. Brands often run multiple ESPs concurrently — marketing on one, transactional on another — so this chart shows usage rather than switches.
IP addresses edx.org has been observed sending from, and where their mail landed in Gmail.
| IP | Hostname | Obs | Placement | Reputation |
|---|---|---|---|---|
| 13.111.142.132 | mta.sfmc.edx.org |
5 | — | Check → |
| 13.111.127.7 | mta2.sfmc.edx.org |
5 | 2 | Check → |
| 13.111.142.102 | is102.mta.exacttarget.com |
5 | — | Check → |
| 13.111.142.131 | mta4.sfmc.edx.org |
4 | 1 | Check → |
| 13.111.142.141 | is141.mta.exacttarget.com |
3 | 1 | Check → |
| 156.70.13.154 | mta-70-13-154.sparkpostmail.com |
1 | — | Check → |
| 13.111.142.116 | is116.mta.exacttarget.com |
1 | — | Check → |
| Domain | ESPs detected | Delivery (7d) |
|---|---|---|
sfmc.edx.org | Salesforce MC 22 | |
news.edx.org | SparkPost 1 | |
sfmc2.edx.org | Salesforce MC 1 |
