Vercel uses Customer.io for marketing email and SendGrid for transactional/notifications. They rank #4,485 in the Tranco list of most-popular domains. We've also observed sends via Amazon SES. Email goes out from 2 different subdomains. Their email authentication setup is solid (score 95/100). We've recorded 1 ESP change 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 1 email we've observed. DMARC policy is read live from DNS.
DMARC reports sent to DMARC Analyzer (Mimecast). Policy
p=quarantine means receivers actively block or quarantine spoofed mail.
SPF alignment: all 16 observed emails use a return-path aligned with vercel.com (em7637.info.vercel.com, cio148641.info.vercel.com, mail.vercel.com). SPF authenticates the visible From — supports DMARC directly.
DKIM alignment: all 13 observed emails sign with a domain aligned with vercel.com (info.vercel.com, cio148641.info.vercel.com, vercel.com). DKIM authenticates the visible From — supports DMARC directly.
TLS: 33% TLS 1.3, 67% TLS 1.2 (across 6 sends).
2 of 2 emails in the last 7 days were delayed beyond 5 minutes (100%) — delays stayed within 5–15 minutes. Slow sends averaged 5 min 43 sec. Healthy senders deliver in under 30 seconds. Consistent delays usually mean greylisting, reputation-based throttling, or receiver-side filter scrutiny — worth investigating sender reputation and authentication setup.
Brands often use multiple ESPs (e.g. one for marketing, another for transactional/notifications).
Amazon SES 5ESPs 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: vercel.com, bounce.vercel.com, mail.vercel.com, em7637.info.vercel.com, cio148641.info.vercel.com, info.vercel.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 | 19 | 100.0% |
Placement observed in Outlook / Microsoft 365 mailboxes. Focused Inbox splits mail into two tabs, "Focused" (inbox) and "Other", plus Junk. 100% reached the Focused inbox across 1 observed email.
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 | 6 | 100.0% | 0.0% | 0.0% | |
| SendGrid | 5 | 100.0% | 0.0% | 0.0% | |
| Amazon SES | 4 | 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 vercel.com has been observed sending from, and where their mail landed in Gmail.
| IP | Hostname | Obs | Placement | Reputation |
|---|---|---|---|---|
| 143.55.232.15 | v515.v5f06b487.use4.send.mailgun.net |
4 | — | Check → |
| 206.55.150.64 | h150-64.smtp-out.us-west-2.amazonses.com |
2 | — | Check → |
| 143.55.232.36 | v536.v5f06b487.use4.send.mailgun.net |
2 | 2 | Check → |
| 54.240.42.184 | a42-184.smtp-out.amazonses.com |
1 | — | Check → |
| 23.251.237.243 | e237-243.smtp-out.us-west-2.amazonses.com |
1 | — | Check → |
| 54.240.119.62 | a119-62.smtp-out.us-west-2.amazonses.com |
1 | — | Check → |
| Domain | ESPs detected | Delivery (7d) |
|---|---|---|
info.vercel.com | SendGrid 9 Customer.io 6 | 🐢 2/2 slow (avg 5 min 43 sec) |
vercel.com | Amazon SES 5 |
