Wispr uses Customer.io for marketing email and Amazon SES for transactional/notifications. They rank #733,432 in the Tranco list of most-popular domains. Email goes out from 3 different subdomains. Their email authentication setup is solid (score 85/100). We've recorded 2 ESP changes since first observing this brand.
Amazon SESAuthentication 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 9 emails we've observed. DMARC policy is read live from DNS.
DMARC reports sent to wisprflow.ai. Policy
p=reject means receivers actively block or quarantine spoofed mail.
SPF alignment: all 19 observed emails use a return-path aligned with wispr.ai (bounce.wispr.ai, cio107418.mail.wispr.ai, em5874.wispr.ai). SPF authenticates the visible From — supports DMARC directly.
DKIM alignment: all 14 observed emails sign with a domain aligned with wispr.ai (wispr.ai, cio107418.mail.wispr.ai, cio107418.updates.wispr.ai). DKIM authenticates the visible From — supports DMARC directly.
TLS: 70% TLS 1.3, 30% TLS 1.2 (across 10 sends).
Delivery: fast — 100% of emails in the last 7 days arrive in under 10 seconds (across 7 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: wispr.ai, bounce.wispr.ai, em5874.wispr.ai, cio107418.mail.wispr.ai, cio107418.updates.wispr.ai, mail.wispr.ai, updates.wispr.ai
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 | 17 | 85.0% |
| promotions | 3 | 15.0% |
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 % |
|---|---|---|---|---|---|
| Customer.io | 11 | 72.7% | 27.3% | 0.0% | |
| Amazon SES | 7 | 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 wispr.ai has been observed sending from, and where their mail landed in Gmail.
| IP | Hostname | Obs | Placement | Reputation |
|---|---|---|---|---|
| 69.72.44.8 | v58.v5e5d4d68.usw1.send.mailgun.net |
7 | 2 | Check → |
| 54.240.42.184 | a42-184.smtp-out.amazonses.com |
4 | 2 | Check → |
| 159.183.23.197 | o3.mail.wisprflow.com |
3 | 1 | Check → |
| 159.112.253.28 | v528.v59719d68.use4.send.mailgun.net |
2 | — | Check → |
| 54.240.61.166 | a61-166.smtp-out.us-west-2.amazonses.com |
2 | 1 | Check → |
| 54.240.61.167 | a61-167.smtp-out.us-west-2.amazonses.com |
2 | 2 | Check → |
| 161.38.192.97 | v597.v56682d52.use4.send.mailgun.net |
1 | — | Check → |
| Domain | ESPs detected | Delivery (7d) |
|---|---|---|
wispr.ai | Amazon SES 8 Customer.io 3 | |
mail.wispr.ai | Customer.io 9 | |
updates.wispr.ai | Customer.io 1 |