Grammarly uses Iterable as their primary email service provider. They rank #554 in the Tranco list of most-popular domains. We've also observed sends via Salesforce MC. Email goes out from 2 different subdomains. Their email authentication setup is solid (score 100/100).
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 Validity (250ok). Policy
p=reject means receivers actively block or quarantine spoofed mail.
SPF alignment: all 67 observed emails use a return-path aligned with grammarly.com (bounces.grammarly.com, bounce.send.grammarly.com). SPF authenticates the visible From — supports DMARC directly.
DKIM alignment: all 55 observed emails sign with a domain aligned with grammarly.com (mail.grammarly.com, send.grammarly.com). DKIM authenticates the visible From — supports DMARC directly.
VMC issued by: digicert.
TLS: 0% TLS 1.3, 100% TLS 1.2 (across 21 sends).
1 of 6 emails in the last 7 days were delayed beyond 5 minutes (17%) — some sends took over an hour to arrive. Slow sends averaged 1 h 33 min. 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).
Salesforce MC 1ESPs 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: grammarly.com, bounces.grammarly.com, bounce.send.grammarly.com, mail.grammarly.com, send.grammarly.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 | 72 | 93.5% |
| promotions | 5 | 6.5% |
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 % |
|---|---|---|---|---|---|
| Iterable | 70 | 92.9% | 7.1% | 0.0% | |
| Salesforce MC | 1 | 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 grammarly.com has been observed sending from, and where their mail landed in Gmail.
| IP | Hostname | Obs | Placement | Reputation |
|---|---|---|---|---|
| 168.203.32.163 | mta-203-32-163.info.grammarly.com.sparkpostmail.com |
8 | 1 | Check → |
| 168.203.32.153 | mta-203-32-153.info.grammarly.com.sparkpostmail.com |
7 | 1 | Check → |
| 168.203.32.154 | mta-203-32-154.info.grammarly.com.sparkpostmail.com |
6 | — | Check → |
| 168.203.32.151 | mta-203-32-151.info.grammarly.com.sparkpostmail.com |
5 | — | Check → |
| 168.203.32.155 | mta-203-32-155.info.grammarly.com.sparkpostmail.com |
5 | 1 | Check → |
| 168.203.32.158 | mta-203-32-158.info.grammarly.com.sparkpostmail.com |
5 | — | Check → |
| 168.203.32.150 | mta-203-32-150.info.grammarly.com.sparkpostmail.com |
5 | 1 | Check → |
| 168.203.32.146 | mta-203-32-146.info.grammarly.com.sparkpostmail.com |
5 | — | Check → |
| 168.203.32.159 | mta-203-32-159.info.grammarly.com.sparkpostmail.com |
5 | 2 | Check → |
| 168.203.32.160 | mta-203-32-160.info.grammarly.com.sparkpostmail.com |
4 | 1 | Check → |
| 168.203.32.152 | mta-203-32-152.info.grammarly.com.sparkpostmail.com |
4 | — | Check → |
| 168.203.32.156 | mta-203-32-156.info.grammarly.com.sparkpostmail.com |
4 | — | Check → |
| 168.203.32.157 | mta-203-32-157.info.grammarly.com.sparkpostmail.com |
3 | 2 | Check → |
| 168.203.32.162 | mta-203-32-162.info.grammarly.com.sparkpostmail.com |
3 | 1 | Check → |
| 168.203.32.147 | mta-203-32-147.info.grammarly.com.sparkpostmail.com |
2 | — | Check → |
| 168.203.32.149 | mta-203-32-149.info.grammarly.com.sparkpostmail.com |
2 | — | Check → |
| 168.203.32.161 | mta-203-32-161.info.grammarly.com.sparkpostmail.com |
2 | — | Check → |
| 168.203.32.148 | mta-203-32-148.info.grammarly.com.sparkpostmail.com |
2 | 1 | Check → |
| 199.122.124.187 | mta2.send.grammarly.com |
1 | 1 | Check → |
| Domain | ESPs detected | Delivery (7d) |
|---|---|---|
mail.grammarly.com | Iterable 77 | |
send.grammarly.com | Salesforce MC 1 |
