Twilio uses Marketo for marketing email and SendGrid for transactional/notifications. They rank #1,801 in the Tranco list of most-popular domains. We've also observed sends via 2 other providers: Amazon SES, SparkPost. Email goes out from 3 different subdomains. Their email authentication setup is solid (score 100/100). We've recorded 4 ESP changes since first observing this brand.
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 10 emails we've observed. DMARC policy is read live from DNS.
DMARC reports sent to vali.email. Policy
p=reject means receivers actively block or quarantine spoofed mail.
SPF alignment: 84% of observed emails use an aligned return-path (marketopages.twilio.com, smtpgw.twilio.com, em2158.growth.twilio.com); the rest use third-party paths (admin.a1ms.jcboe.org, rezza.fattah.id, bounce.impartnerprm.com) where DMARC has to rely on DKIM alignment.
DKIM alignment: all 41 observed emails sign with a domain aligned with twilio.com (twilio.com, marketopages.twilio.com, growth.twilio.com). DKIM authenticates the visible From — supports DMARC directly.
VMC issued by: valimail.
TLS: modern — 96% TLS 1.3 (across 26 sends).
Delivery: fast — 100% of emails in the last 7 days arrive in under 10 seconds (across 11 sends).
Brands often use multiple ESPs (e.g. one for marketing, another for transactional/notifications).
Amazon SES 2 Zendesk 1 SparkPost 1ESPs 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: twilio.com, marketopages.twilio.com, smtpgw.twilio.com, fun.twilio.com, em2158.growth.twilio.com, mail.careerhub.twilio.com, rezza.fattah.id, admin.a1ms.jcboe.org, bounce.impartnerprm.com, team.twilio.com, growth.twilio.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 | 40 | 95.2% |
| promotions | 2 | 4.8% |
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 % |
|---|---|---|---|---|---|
| SendGrid | 16 | 100.0% | 0.0% | 0.0% | |
| Marketo | 19 | 89.5% | 10.5% | 0.0% | |
| Amazon SES | 2 | 100.0% | 0.0% | 0.0% | |
| SparkPost | 1 | 100.0% | 0.0% | 0.0% | |
| Zendesk | 1 | 100.0% | 0.0% | 0.0% |
Weekly 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 twilio.com has been observed sending from, and where their mail landed in Gmail.
| IP | Hostname | Obs | Placement | Reputation |
|---|---|---|---|---|
| 149.72.185.22 | o6.smtpgw.twilio.com |
21 | 5 | Check → |
| 167.89.35.30 | o7.smtpgw.twilio.com |
4 | — | Check → |
| 167.89.35.33 | o8.smtpgw.twilio.com |
4 | 2 | Check → |
| 54.240.27.241 | a27-241.smtp-out.us-west-2.amazonses.com |
2 | 2 | Check → |
| 15.235.130.133 | tresoralacle.com |
2 | — | Check → |
| 149.72.175.253 | wrqvxffd.outbound-mail.sendgrid.net |
1 | — | Check → |
| 192.161.152.40 | mta-out10.pod27.use2.zdsys.com |
1 | — | Check → |
| 159.183.177.213 | wfbtbkdr.outbound-mail.sendgrid.net |
1 | — | Check → |
| 192.174.86.136 | mta-86-136.sparkpostmail.com |
1 | 1 | Check → |
