Rb2b uses SendGrid as their primary email service provider. They rank #355,620 in the Tranco list of most-popular domains. We've also observed sends via Amazon SES. Their email authentication setup is solid (score 85/100). 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 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: all 18 observed emails use a return-path aligned with rb2b.com (outbound.intercom.rb2b.com, em4021.rb2b.com, bounce.rb2b.com). SPF authenticates the visible From — supports DMARC directly.
DKIM alignment: all 18 observed emails sign with a domain aligned with rb2b.com (rb2b.com). DKIM authenticates the visible From — supports DMARC directly.
TLS: 62% TLS 1.3, 38% TLS 1.2 (across 13 sends).
Delivery (last 7 days): 75% under 10 seconds, 0% over 1 minute (across 8 sends).
Brands often use multiple ESPs (e.g. one for marketing, another for transactional/notifications).
Intercom 7 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: rb2b.com, em4021.rb2b.com, outbound.intercom.rb2b.com, bounce.rb2b.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 | 18 | 100.0% |
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 % |
|---|---|---|---|---|---|
| Amazon SES | 5 | 100.0% | 0.0% | 0.0% | |
| Intercom | 7 | 100.0% | 0.0% | 0.0% | |
| SendGrid | 6 | 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 rb2b.com has been observed sending from, and where their mail landed in Gmail.
| IP | Hostname | Obs | Placement | Reputation |
|---|---|---|---|---|
| 149.72.69.93 | o1.ptr8578.getemails.com |
6 | 1 | Check → |
| 192.174.84.116 | mta-174-84-116.intercom.com.sparkpostmail.com |
3 | — | Check → |
| 54.240.61.166 | a61-166.smtp-out.us-west-2.amazonses.com |
3 | 3 | Check → |
| 192.174.84.115 | mta-174-84-115.intercom.com.sparkpostmail.com |
2 | 1 | Check → |
| 54.240.42.185 | a42-185.smtp-out.amazonses.com |
2 | 2 | Check → |
| 192.174.84.114 | mta-174-84-114.intercom.com.sparkpostmail.com |
2 | 2 | Check → |
| Domain | ESPs detected | Delivery (7d) |
|---|---|---|
rb2b.com | Intercom 7 SendGrid 6 Amazon SES 5 |
