Mailbox hosting + transactional email

KasaPost

Business mailboxes and transactional email, set up with the deliverability checks most teams forget.

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Business mailboxes Team inboxes, aliases, webmail, IMAP, SMTP submission, and domain administration.
Transactional sending API keys, SMTP handoff, logs, webhooks, suppressions, and replyable sender identities.
Deliverability checks SPF, DKIM, DMARC, TLS, rDNS, DNS health, queue visibility, and practical warm-up guidance.
Position

Email operations without stitching three products together.

Most teams split business inboxes from product email. KasaPost brings both into one managed control plane, so domains, mailboxes, sender identities, authentication, logs, and setup work stay connected.

For customer-facing teams

Run addresses like hello@, support@, billing@, and founder mail from a real mailbox system.

For product email

Send receipts, account notices, verification codes, and notifications through a controlled sending lane.

For launch setup

Get DNS records, reverse DNS, DKIM, DMARC, and TLS checked before customers depend on the domain.

For migrations

Plan mailbox moves from Google, Microsoft, Zoho, cPanel, or IMAP with a visible cutover checklist.

Compared with the usual choices

Not another inbox suite. Not only an email API.

Traditional mailbox suites are useful, but transactional email often becomes a separate service. Developer sending APIs are excellent for product teams, but they do not replace business mailbox operations. KasaPost is built for teams that need both.

Compared with mailbox suites More focused on transactional sending, DNS correctness, sender reputation, and setup operations.
Compared with sending APIs Adds actual business mailboxes, aliases, webmail, mailbox migration, and team-facing mail administration.
Compared with cheap hosting More managed, more visible, and more honest about the deliverability work required to send trusted mail.
Launch checklist

What KasaPost helps keep green.

SPFSending hosts aligned to the domain.
DKIMMessages signed by the customer domain.
DMARCPolicy, reporting, and alignment visibility.
rDNSReverse DNS matched to the mail host.
TLSHTTPS and SMTP transport secured.
QueuesOutbound mail checked before it becomes a customer issue.
Ready when the domain matters

Create the company account, prove domain ownership, then publish DNS.

Create business email