# Exclaimer vs CodeTwo Email Signatures 365: 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; two named CodeTwo Email Signatures 365. Page: https://gtm-ai-index.com/marketing/email-signature-management/exclaimer-vs-codetwo-email-signatures-365/

| | First-choice share | Rank | Negative rate | Labels | Models naming it |
|---|---|---|---|---|---|
| Exclaimer | 33% | #1 of 9 | 19% | 64 | 14 of 14 |
| CodeTwo Email Signatures 365 | 8% | #4 of 9 | 15% | 54 | 14 of 14 |

## The direct prompt, model by model

- Gemini 3.5 Flash: both first (first choices: CodeTwo Email Signatures 365, Exclaimer) (alternatives: Newoldstamp, Opensense, Signitic)
- 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)
- 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)
- GPT-6 Luna: codetwo email signatures 365 first (first choices: CodeTwo Email Signatures 365) (alternatives: Exclaimer)
- 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)

## 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 CodeTwo Email Signatures 365

- "CodeTwo Email Signatures 365 - Outlook Integration Issues: Signatures sometimes not displaying immediately or old signatures persisting unexpectedly" (GLM 4.7 FlashX, negative prompt, hard negative)
- "Lacks SCIM ... These gaps make it unsuitable for regulated industries" (Mistral Small, negative prompt, hard negative)
- "Tools like CodeTwo and Exclaimer sometimes face complaints about Outlook rendering inconsistencies, slow syncing, or steep learning curves" (Grok 4.1 Fast, negative prompt, soft negative)
- "If your company is Microsoft 365‑only and IT prefers to manage governance centrally, CodeTwo Email Signatures 365 is the best choice." (GLM 4.7 FlashX, paraphrase prompt, first choice)
- "If your B2B organization runs entirely on Microsoft 365 and Outlook, CodeTwo is widely considered the gold standard." (Gemini 3.5 Flash, direct prompt, first choice)
- "centralized, server-side platforms like Exclaimer, CodeTwo, and Letsignit as the safer class of tools" (Perplexity Sonar, negative prompt, first choice)

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.