GitHub uses Marketo for marketing email and SendGrid for transactional/notifications. They rank #29 in the Tranco list of most-popular domains. Email goes out from 2 different subdomains. Their email authentication setup is good (score 80/100).
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.
DMARC reports sent to github.com. Policy
p=quarantine means receivers actively block or quarantine spoofed mail.
SPF alignment: 78% of observed emails use an aligned return-path (sgmail.github.com); the rest use third-party paths (bounce5.email.microsoft.com) where DMARC has to rely on DKIM alignment.
DKIM alignment: all 7 observed emails sign with a domain aligned with github.com (github.com, email.github.com). DKIM authenticates the visible From — supports DMARC directly.
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: github.com, sgmail.github.com, bounce5.email.microsoft.com, email.github.com
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 | 8 | 88.9% |
| promotions | 1 | 11.1% |
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 % |
|---|---|---|---|---|---|
| Marketo | 2 | 100.0% | 0.0% | 0.0% | |
| SendGrid | 7 | 85.7% | 14.3% | 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 github.com has been observed sending from, and where their mail landed in Gmail.
| IP | Hostname | Obs | Reputation |
|---|---|---|---|
| 167.89.101.199 | xtrwsrct.outbound-mail.sendgrid.net |
3 | Check → |
| 199.15.214.201 | bounce3.email.microsoft.com |
2 | Check → |
| 167.89.8.226 | xtrwhvzn.outbound-mail.sendgrid.net |
1 | Check → |
| 192.254.112.99 | o4.sgmail.github.com |
1 | Check → |
| 192.254.112.98 | o3.sgmail.github.com |
1 | Check → |
| 167.89.101.2 | xtrwsrhn.outbound-mail.sendgrid.net |
1 | Check → |
Per-IP inbox / promotions / spam is being collected and will appear here as new emails are observed.