About PostMaster
PostMaster is a practical tool for email migration based on IMAP. It is designed to move mailboxes safely between providers without data loss.
What PostMaster Does
- copies emails directly between servers
- preserves folder structure
- supports large mailboxes
- works without local email clients
Instead of downloading emails to your computer and uploading them again, PostMaster performs direct server-to-server transfer.
Why It Exists
Email migration is often more complex than expected. Manual methods are slow and unreliable, especially for large mailboxes.
PostMaster was built to solve this problem in a controlled and predictable way.
How It Works
- connect to source IMAP server
- connect to destination IMAP server
- analyze mailbox
- transfer messages safely
Before starting migration, you can validate your server using: IMAP Server Validator
Related Tools
- IP Address Diagnostics — check connectivity and latency
- FileDrop — send large files without email limits