# Exclaimer vs Newoldstamp: which do AI models recommend for email signatures, October 2026

GTM AI Recommendation Index, October 2026 Edition, Email signature management. Nine of fourteen models named Exclaimer first on the direct prompt; zero named Newoldstamp. Page: https://gtm-ai-index.com/marketing/email-signature-management/exclaimer-vs-newoldstamp/

| | First-choice share | Rank | Negative rate | Labels | Models naming it |
|---|---|---|---|---|---|
| Exclaimer | 33% | #1 of 9 | 19% | 64 | 14 of 14 |
| Newoldstamp | 2% | #6 of 9 | 5% | 22 | 12 of 14 |

## The direct prompt, model by model

- Claude Haiku 4.5: exclaimer first (first choices: Exclaimer) (alternatives: CodeTwo Email Signatures 365, Newoldstamp, Rocketseed)
- GPT-5.4 mini: exclaimer first (first choices: Exclaimer) (alternatives: CodeTwo Email Signatures 365)
- Gemini 3.5 Flash: exclaimer first (first choices: CodeTwo Email Signatures 365, Exclaimer) (alternatives: Newoldstamp, Opensense, Signitic)
- Perplexity Sonar: exclaimer first (first choices: Exclaimer) (alternatives: Letsignit, Opensense, Rocketseed, WiseStamp)
- Grok 4.1 Fast: exclaimer first (first choices: Exclaimer) (alternatives: CodeTwo Email Signatures 365, WiseStamp)
- Mistral Small: exclaimer first (first choices: Exclaimer, WiseStamp) (alternatives: CodeTwo Email Signatures)
- DeepSeek V4 Flash: exclaimer first (first choices: Exclaimer) (alternatives: CodeTwo Email Signatures 365, WiseStamp)
- Llama 4 Maverick: exclaimer first (first choices: Exclaimer, WiseStamp) (alternatives: Opensense)
- Muse Glimmer 30B: exclaimer first (first choices: Exclaimer, WiseStamp) (alternatives: Opensense)
- Qwen 3.7 Flash: neither first, one named (first choices: WiseStamp) (alternatives: Exclaimer, Opensense)
- Kimi K2: neither first, one named (first choices: WiseStamp) (alternatives: Exclaimer)
- GLM 4.7 FlashX: neither first, one named (first choices: SyncSignature) (alternatives: CodeTwo Email Signatures 365, Exclaimer, Letsignit)
- MiniMax M2.5: neither first, one named (first choices: WiseStamp) (alternatives: Exclaimer, Opensense)
- GPT-6 Luna: neither first, one named (first choices: CodeTwo Email Signatures 365) (alternatives: Exclaimer)

## What the models said about Exclaimer

- "One Exclaimer review specifically mentions discomfort with having emails routed through a "random server"... "can cause mail routing issues with Barracuda"" (GPT-5.4 mini, negative prompt, soft negative)
- "significantly more affordable than enterprise solutions like Exclaimer or Rocketseed, which typically require custom pricing and higher minimum spends" (Kimi K2, budget prompt, soft negative)
- "Competitors like Exclaimer (~$0.90-$1.50/user/mo but often higher for small biz)... either lack a solid free tier or require minimums/commitments." (Grok 4.1 Fast, budget prompt, soft negative)
- "Choose Exclaimer if you are a large enterprise, heavily invested in Microsoft 365, and need the most comprehensive security certifications" (Kimi K2, comparative prompt, first choice)
- "Choose Exclaimer if you need enterprise-grade control, strong compliance credentials, and reliable organization-wide enforcement." (Perplexity Sonar, comparative prompt, first choice)
- "Widely recognized enterprise leader with the broadest certification set; reliable and battle-tested across massive Microsoft 365 estates" (DeepSeek V4 Flash, comparative prompt, first choice)

## What the models said about Newoldstamp

- "Free tiers (e.g., some in Newoldstamp or MySignature) often limit features, leading to unexpected upgrades." (Grok 4.1 Fast, negative prompt, soft negative)
- "Newoldstamp is the best overall email signature management platform for teams who want to combine administrative simplicity with marketing campaigns" (Claude Haiku 4.5, paraphrase prompt, first choice)
- "Newoldstamp is a cloud-based signature manager built specifically around signature marketing and departmental customization." (Gemini 3.5 Flash, paraphrase prompt, alternative)
- "Newoldstamp is worth considering if marketing team control and integrations with systems like ... matter most" (Perplexity Sonar, paraphrase prompt, alternative)

Share is the count of first choices across the direct, paraphrase, budget and scale prompts over all fourteen models, for a mid-market B2B company; rank is within the category. Comparisons are drawn for the top eight products in each category. Published under CC BY 4.0; the output is the models' output, and nothing here is a recommendation by the index.