8 min read
Best AI email clients for 2026: 8 apps compared
Eight AI email clients compared on what their AI does, the mail they work with and the price in 2026, from Nextmail and Superhuman to Gmail and Outlook.
BenjaminAIBlog
Notes on email,
from the people building it.
Guides on deliverability, domains and the inbox, written by the Nextmail team. Every claim links to its source.
BenjaminAI6 min read
How to build your own email client on Nextmail
What you need to build your own email client on Nextmail: OAuth sign-in for your users, typed SDKs in seven languages, live events, webhooks and raw messages.
ArtaDevelopers5 min read
Email as a mailbox: why AI agents need a real inbox
Most email APIs only send. What a real mailbox adds for apps and AI agents, the four ways to get one in 2026, and how much code each leaves you.
BenjaminAI9 min read
Resend pricing in 2026: what it costs, how to pay less
What Resend costs at 50,000 to 1,000,000 emails a month, with every plan, overage rate and add-on, and what the same mail costs on Nextmail.
BenjaminComparisons5 min read
SPF, DKIM and DMARC explained: how inboxes trust mail
What SPF, DKIM and DMARC each check, why alignment decides whether DMARC passes, and a safe order for moving a domain from p=none to p=reject.
BenjaminDeliverability9 min read
What is an email client? How email clients work
An email client is the app you read and send mail in, apart from the service that holds your mailbox. How clients find servers, sync, send and guard privacy.
BenjaminEmail clients10 min read
What is BIMI? Inbox logos and how to get a certificate
BIMI is a DNS record that puts your logo beside mail that passes DMARC. How the record, the BIMI logo and VMC or CMC certificates work, inbox by inbox.
ArtaDeliverability9 min read
What is DKIM? How DKIM signatures and records work
DKIM is a signature on every email that proves which domain vouches for it and that nothing changed on the way. How it works, tag by tag, and which keys to use.
BenjaminDeliverability9 min read
What is DMARC? Policy, reports and getting to p=reject
DMARC is a DNS record that checks SPF and DKIM against your visible From domain, tells inboxes what to do with mail that fails and reports who sends as you.
ArtaDeliverability10 min read
What is IMAP? How IMAP works: ports, sync and security
IMAP is how mail apps read and organise mail that stays on the server, in sync on every device. How it works, which port to use and how it compares with POP3.
ArtaProtocols6 min read
What is JMAP? The JSON email protocol, explained
JMAP is the IETF standard for email, contacts and calendars over JSON and HTTPS. How it works, how it differs from IMAP, and who supports it in 2026.
ArtaDevelopers10 min read
What is SMTP? How it works, from ports to reply codes
SMTP is the protocol that carries email from your app to your provider and between mail servers. How it works, which port to use and what each reply means.
BenjaminProtocols9 min read
What is SPF? How SPF records work and where they break
SPF is the DNS record that lists the servers allowed to send mail for your domain. How receivers check it, what each part means and what quietly breaks it.
ArtaDeliverabilityTry it yourself
Your email,
on your own domain.
Nextmail puts your domains, sending and inbox in one place, with the full API on every plan, the free one included.
Google Workspace