Hiver VS Postfleet
Compare Hiver VS Postfleet and see what are their differences
Automated 60-second forensic business auditing pipeline powered by OpenAI Nano AI. Built for consultants and analysts.
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Hiver
Freshdesk
MailClark
Nylas Mail
Clean Email
Email Signature Rescue
DuoCircle
Front
Postfleet
Nylas Mail
Evolution
Mailbird
Mailpile
Polymail
Robotomail
Say hello to the customer service platform for the modern AI era. Make exceptional service feel effortless by letting AI agents handle the busywork.
Postfleet is inbound email infrastructure for AI agents, built on the assumption that any message can be an attack.
Every message runs the same pipeline before your agent sees it: SPF/DKIM/DMARC checks, HTML-to-text cleaning, removal of hidden elements, HTML comments and zero-width characters, malware and spam screening, then a prompt-injection scan. What comes out is typed JSON matching a schema you define.
It fails closed. Malware is quarantined, spam is suppressed, and a message flagged for injection risk never reaches extraction โ your agent gets an explicit status (skippedinjectionrisk) instead of quietly poisoned context. The pre-sanitization body is never sent to agent-facing tools.
Connect over MCP with 14 tools (Claude, Claude Code, Cursor, Windsurf, Cline, VS Code) or use the REST API. Sends are idempotent โ retry with the same client_id and the email goes out at most once โ with optional human approval before anything irreversible leaves.
We publish the red-team scoreboard, including what got through and one false flag we caught ourselves: 99.1% of 113 attacks caught, most written by independent models and a public benchmark rather than by us. Screened against known patterns, never claimed immune.
Free: 100 messages, 3 mailboxes. Sanitization and injection screening are never metered.
Hiver PostfleetHiver is recommended for customer support teams, sales teams, and any organization that wants to manage shared email accounts with greater efficiency. It is particularly beneficial for small to midsize businesses that are already using Google Workspace and want a tool that can easily integrate into their existing workflows.
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Postfleet's answer:
It treats an agent's inbox as a trust boundary, not a pipe. Every inbound email is screened for prompt injection, stripped of hidden text, and turned into structured JSON before the agent ever reads it. The unusual part: I red-team the filter with rival models and publish the whole scoreboard, catches and misses both. Screened, never immune.
Postfleet's answer:
Most email APIs for agents hand you the raw body and leave defense to your app layer. Postfleet screens first and fails closed, so flagged mail reaches the agent as inert data instead of trusted content. It's backed by an injection guarantee and a public red-team scoreboard, so the security claim comes with receipts rather than a marketing number.
Postfleet's answer:
Developers building AI agents that receive email: indie hackers, agent-framework builders, and small platform teams wiring an agent to an inbox. People who've read at least one prompt-injection horror story and would rather see published results than take a claim on faith.
Postfleet's answer:
I've spent 18 years building software, the last 6 as an architect drawing trust boundaries between systems that shouldn't blindly trust each other. When I watched people give AI agents email inboxes, I saw the boundary everyone skipped: anyone who can email an agent can drop instructions into its context. Postfleet is that missing boundary.
Postfleet's answer:
Next.js, TypeScript, and Supabase (Postgres), deployed on Vercel. An MCP server so an agent can sign itself up. Anthropic models run the injection scan and schema extraction, Resend/SES handles inbound mail, and ClamAV scans attachments.
Based on our record, Hiver seems to be more popular. It has been mentiond 5 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Depending on the potential value of the workflow, https://gmelius.com/ and https://hiverhq.com/ are both pretty awesome. Source: over 3 years ago
If you're u sing shared inboxes, you may want to consider https://hiverhq.com/ or https://www.dragapp.com/ for doing shared inbox functionality with workspace. Source: over 3 years ago
You might want to check out Hiver. It's built on top of Gmail, it's really easy to set up and even easier to grasp. It has all the features that your team would need to run its support operations successfully. And its pretty cost-effective against Zendesk. Source: over 3 years ago
Hey I was wondering if you considered trying Hiver since you mentioned that all CX operations were conducted out of Gmail. Hiver's a support solution that works on top of Gmail UI and is therefore really easy to use. Full disclosure: I work with the content team at Hiver. Source: over 3 years ago
I'm thinking that all these other apps might be facilitated in Mattermost. Probably not the email client and inbox email sharing but perhaps there's an integration to another tool like front.com or hiverhq.com (gmail based) that would help take care of managing email too. Source: almost 4 years ago
Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community
Nylas Mail - The Nylas Cloud API powers your application with email, calendar & contacts features. Built-in features for better email, calendar, and contact management.
MailClark - The Slack bot for external communications
Evolution - Apps/Evolution - GNOME Wiki!
Mailbird - Mailbird is the best email client for Windows 7, 8 and 10
Clean Email - Clean Email is an online service that empowers you to take control of your mailbox.