# Google Postmaster Tools alternatives: what AI models name instead, October 2026

GTM AI Recommendation Index, October 2026 Edition. 194 of the 252 answers in the 1 category where Google Postmaster Tools holds a standing named it neither first nor as an alternative; these are the first choices those answers made. Page: https://gtm-ai-index.com/vendors/google-postmaster-tools/alternatives/

## Named instead, most often (every category and segment added)

- GlockApps: 41
- Validity Everest: 32
- Litmus: 9
- Instantly: 7
- MailReach: 5
- Everest: 4

## Email deliverability and testing tools

**Small business**: 58 of 84 answers did not name Google Postmaster Tools (Google Postmaster Tools is #2 of 15 at 10%).

- GlockApps: first choice in 14 of those 58
- Litmus: first choice in 4 of those 58
- Email on Acid: first choice in 3 of those 58
- Instantly: first choice in 3 of those 58
- Mail-Tester: first choice in 3 of those 58
- MailerCheck: first choice in 3 of those 58
- MailReach: first choice in 2 of those 58
- Mailtrap: first choice in 2 of those 58

**Mid-market**: 62 of 84 answers did not name Google Postmaster Tools (Google Postmaster Tools is #2 of 12 at 9%).

- GlockApps: first choice in 27 of those 62
- MailReach: first choice in 3 of those 62
- Folderly: first choice in 2 of those 62
- Validity Everest: first choice in 2 of those 62
- Allegrow: first choice in 1 of those 62
- EmailListVerify: first choice in 1 of those 62
- InboxArmy: first choice in 1 of those 62
- Instantly: first choice in 1 of those 62

**Enterprise**: 74 of 84 answers did not name Google Postmaster Tools (Google Postmaster Tools is #9 of 14 at 0%).

- Validity Everest: first choice in 30 of those 74
- Litmus: first choice in 5 of those 74
- Everest: first choice in 4 of those 74
- Instantly: first choice in 3 of those 74
- Mailgun: first choice in 3 of those 74
- SendGrid: first choice in 3 of those 74
- Validity Engage: first choice in 3 of those 74
- Folderly: first choice in 2 of those 74

Published under CC BY 4.0. The output is the models' output; nothing here is a recommendation by the index.