Email Detective — ESP Tracker

Omnisend

omnisend.com ↗

🏆Rank #22,235 🏷 SaaS 🇱🇹Lithuania 📥 Inbox 83%

Omnisend uses Omnisend for marketing email and SendGrid for transactional/notifications. They rank #22,235 in the Tranco list of most-popular domains. We've also observed sends via 14 other providers: Customer.io, HubSpot, Amazon SES, Mailchimp, Beehiiv, Iterable, Braze, Klaviyo, Salesforce MC, ActiveCampaign, Brevo, Postmark, Substack, dEngage. Email goes out from 14 different subdomains. Their email authentication setup is solid (score 85/100). We've recorded 23 ESP changes since first observing this brand.

Marketing ESPOmnisend

Transactional ESPSendGrid

Total observations475

Active days50

Avg per active day9.5

Last activity📬 Active · today

Cadence~every 2 days

Other technologies

Non-ESP tools detected in this brand's emails. Independent of who sends — a brand can use any combination.

HTML builder

Beefree SDK

Email setup 85/100

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 10 emails we've observed. DMARC policy is read live from DNS.

DMARC reports sent to soundest.email. Policy p=reject means receivers actively block or quarantine spoofed mail.

SPF alignment: 86% of observed emails use an aligned return-path (outbound.intercom.omnisend.com, f.la.soundest.email, e.la.soundest.email); the rest use third-party paths (bf07x.hubspotemail.net) where DMARC has to rely on DKIM alignment.

DKIM alignment: all 410 observed emails sign with a domain aligned with omnisend.com (omnisend.com, news.omnisend.com, f.la.soundest.email). DKIM authenticates the visible From — supports DMARC directly.

TLS: 38% TLS 1.3, 62% TLS 1.2 (across 250 sends).

Delivery: fast — 93% of emails in the last 7 days arrive in under 10 seconds (across 67 sends).

Other ESPs detected

Brands often use multiple ESPs (e.g. one for marketing, another for transactional/notifications).

Confirmed senders

ESPs 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.

HubSpot ✓ confirmed SendGrid ✓ confirmed Omnisend ✓ via Mailgun Intercom ✓ via SparkPost Braze ✓ via SendGrid Klaviyo ✓ via SendGrid Beehiiv ✓ via SendGrid Customer.io ✓ via Mailgun Iterable ✓ via SparkPost Amazon SES observed Mailchimp observed

"Observed" pills mean we detected emails from these ESPs, but they don't appear in any SPF record we probed. They may still be properly authorized — sending infrastructure can live on subdomains we haven't seen yet, or use IP-listing instead of include: directives.

Other SPF authorizations

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.

Google Workspace Mailgun SparkPost

Probed: omnisend.com, outbound.intercom.omnisend.com, b.soundest1.com, bf07x.hubspotemail.net, h.la.soundest.email, d.la.soundest.email, e.lb.soundest.email, f.la.soundest.email, j.lc.soundest.email, g.la.soundest.email, e.la.soundest.email, news.omnisend.com

Where emails landed (Gmail)

Folder distribution across all emails from this brand observed in Gmail inboxes. High inbox % = good deliverability; spam appearances are the headline signal.

Placement by ESP

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.

Daily observations per ESP. Brands often run multiple ESPs concurrently — marketing on one, transactional on another — so this chart shows usage rather than switches.

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Sending IPs

IP addresses omnisend.com has been observed sending from, and where their mail landed in Gmail.

Sending domains