Engineered for Zero-Loss Email Migrations
Email Migration was built by the cloud infrastructure team at Hostkro to solve a fundamental problem: moving mailboxes across cloud providers shouldn't risk losing unread flags, folder trees, or hoarding your sensitive messages on untrusted third-party disks.
The Story Behind the Platform
For years, IT teams, hosting providers, and independent developers faced the same dilemma when migrating email: either pay exorbitant per-mailbox licensing fees to legacy vendors or run fragile, CLI-based scripts that frequently crashed, failed on large attachments, or stripped vital message metadata.
Most alarming of all, conventional migration services stage user email onto intermediary hard drives or databases before uploading it to the destination. In an era of strict privacy regulations like GDPR and HIPAA, storing gigabytes of confidential corporate emails on intermediate storage is an unacceptable liability.
We founded Email Migration with a simple, uncompromising mandate: pure socket-to-socket streaming. Every email is streamed directly in memory from source IMAP to target IMAP over TLS 1.3 encryption, and memory buffers are immediately purged.
How We Guarantee High Fidelity
Zero Disk Writes (RAM Streaming)
Your emails never touch a hard disk, SSD, or database on our servers. Streaming occurs in transient in-memory ring buffers that are instantly cleared the millisecond a message is accepted by the target host.
Byte-for-Byte RFC 3501 Fidelity
We replicate the exact raw RFC 822 MIME message bodies, preserving inline attachments, cryptographic headers (DKIM/SPF signatures), original timestamps, and flags (\Seen, \Flagged, \Answered).
Multi-Threaded Parallel Pipes
Our migration engine automatically discovers folder hierarchies and spins up concurrent worker pipelines, negotiating optimal batch sizes to maximize transfer speeds (up to 45 MB/s) without triggering rate limits.
Universal Compatibility
Works seamlessly across any standard IMAP/SSL provider, including Google Workspace, Microsoft 365, cPanel, DirectAdmin, Plesk, Hostkro, Fastmail, Zoho, and custom Linux Dovecot/Courier hosts.