Pick MachineMail if you're a developer whose agents act on email from strangers and you want every message checked, with suspicious mail held back before the agent reads it, or if you need many inboxes: they're free on every plan, and Free includes 3,000 messages a month. Pick Agentline NZ if you're one person who wants your own AI assistant to have an email address from a New Zealand service, billed in NZ dollars with no GST added, with guides written for people using ChatGPT, Claude and other assistants rather than for developers. Both have hosted MCP servers that can wait for new mail such as sign-in codes. Agentline NZ texting is coming soon, and we found no texting on MachineMail's pages.
Agentline NZ is the New Zealand service at agentline.nz, not the US AgentLine.
Side by side
MachineMail facts checked 5 Nov 2026 from the sources in each row. Agentline NZ figures come from our pricing and docs.
| Agentline NZ | MachineMail | MachineMail sources | |
|---|---|---|---|
| What it is | Gives an AI assistant its own @agentline.nz email inbox it can send and read email from. For people with personal AI assistants, and developers. Texting is coming soon. | Email API for AI agents. Every incoming email gets a trust check before the agent sees it, and suspicious mail is held back. For developers. | MachineMail home, MachineMail vs AgentMail |
| Email inbox your assistant can read | Yes: name@agentline.nz, live from day one. Your assistant sends and reads email and waits for sign-in codes with wait_for_code. | Yes: unlimited inboxes on machinemail.dev or your own domain. Its MCP tool wait_for_message waits up to a minute for new mail, such as sign-up codes. | MachineMail home, MachineMail vs AgentMail |
| Works with AI assistants (MCP) | Yes: a hosted MCP server at https://agentline.nz/mcp that works in ChatGPT, Claude and other assistants, with nothing to install. A REST API and command-line tool too. | Yes: a hosted MCP server at mcp.machinemail.dev with 16 tools, using OAuth or an API key. | MachineMail vs AgentMail |
| Assistant can sign itself up | Yes. The assistant signs itself up. The owner opens one email link, and adds a card for a paid plan. | Yes. An agent can get a sandbox inbox that lasts 24 hours and sends 10 messages a day, until a person claims it with a six-digit code. | MachineMail vs AgentMail |
| Monthly cost | Free NZ$0 (1 inbox, 100 emails a month). Starter NZ$29/month (1 inbox, 500 emails a month). Pro NZ$79/month (5 inboxes, 2,000 emails a month). No GST added. | Free $0 (3,000 messages a month in and out combined, 100 a day). Pro $9/month (7,500 in and 2,500 out). Team $49/month. Scale $199/month. Inboxes are free on every plan, and paid plans charge for mail past the allowance. | MachineMail pricing |
| Free trial | A free inbox-only plan, and a 7-day free trial of Starter or Pro, card required: 1 email inbox and 50 outbound emails. One free trial per person. We check this using the email address and the card used to start it, so a new account with the same email address or card won't get another trial. | No trial listed. Nothing is billed on Free, and mail past its allowance waits until the allowance resets. | MachineMail pricing |
| Texting | Coming soon. Texting and phone numbers aren't available yet. Join the waitlist at /pricing#texting. | Not listed on the pages we checked. | MachineMail home, MachineMail pricing |
MachineMail's pricing page shows prices in $ without naming the currency. Agentline NZ charges NZD and isn't GST-registered, so no GST is added to its prices.
Common questions
What does each cost?
MachineMail Free is $0 with 3,000 messages a month, and Pro is $9 a month. Its inboxes are free and you pay for mail. Agentline NZ Free is NZ$0 with 1 inbox and 100 outbound emails a month, sent only to your own verified address. Starter is NZ$29 a month (1 inbox, 500 emails) and Pro is NZ$79 a month (5 inboxes, 2,000 emails), with no GST added. The two are priced in different currencies, so compare the allowances you need.
Can my assistant wait for a sign-in code?
Yes, on both. MachineMail's wait_for_message waits up to a minute for new mail. Agentline NZ's wait_for_code waits for a code to arrive and returns it.
Can my assistant sign itself up?
Yes, on both. MachineMail's sandbox inbox lasts 24 hours until a person claims it with a code. On Agentline NZ the assistant signs itself up, you open one email link, and you add a card for a paid plan.
Can either send texts?
We found no texting on MachineMail's pages. Agentline NZ texting is coming soon and it has no phone numbers yet. You can join the waitlist at /pricing#texting.
Sources
All checked 5 Nov 2026.