Enterprise email infrastructure.
Retarus is the 18th most popular transactional ESP we track.
Detected by 10 distinct extension users.
Distribution of brands using Retarus by industry. Helps you gauge whether this ESP is popular with businesses similar to yours. Brands tagged in two industries are counted in both.
Based on 6 of 6 brands tagged. Industries assigned automatically using AI; not every brand is tagged yet.
Where this ESP's emails land in Gmail. Each brand counted once (average of per-brand percentages) so a single high-volume sender can't dominate. Spam placement is mostly driven by the sender (list quality, content, complaint rate). This number reflects both the ESP's infrastructure AND the kind of senders who choose it — not just deliverability quality.
By volume: inbox 49 · promotions 4 (53 emails observed)
Percentages are averaged per brand (each counted once) across 2 brands using Retarus with at least 5 placement observations each.
6 as their primary ESP. Primary users are listed first, then secondary.
| Brand | Role | Obs | Spam | Last seen |
|---|---|---|---|---|
|
Aena
aena.es
|
primary | 5 | 0.0% | 2026-06-18 |
|
Ktm
ktm.com
|
primary | 6 | 0.0% | 2026-06-16 |
|
Ing
ing.es
|
primary | 41 | 0.0% | 2026-06-29 |
|
Aplazame
aplazame.com
|
primary | 2 | — | 2026-06-02 |
|
Quironsalud
quironsalud.es
|
primary | 2 | — | 2026-05-29 |
|
Verti
verti.es
|
primary | 3 | — | 2026-04-29 |
IPs we've observed sending via Retarus. "Brands" = distinct brands seen on each IP; "Placement" = where those emails landed in Gmail (inbox / promotions / spam). Click "reputation" to check the IP on Cisco Talos.
| IP | Hostname | Brands | Obs | Placement | Reputation |
|---|---|---|---|---|---|
| 94.199.93.130 | mailwsout-93-130.transactional-mail-a.com |
1 | 24 | 7 | Check → |
| 185.215.217.206 | mailwsout-c905.transactional-mail-d.com |
1 | 16 | 1 | Check → |
| 185.215.217.10 | mailwsout-c709.transactional-mail-d.com |
1 | 4 | — | Check → |
| 185.215.217.11 | mailwsout-c710.transactional-mail-d.com |
1 | 2 | — | Check → |
| 185.215.218.32 | mailwsout-c1731.transactional-mail-d.com |
1 | 2 | — | Check → |