PostMaster

How To

Step-by-step guide to run a migration.

Before you start

  • Make sure both mailboxes support IMAP.
  • If the provider requires 2FA, use an App Password.
  • Check storage limits on the destination mailbox.
  • For best results, avoid changing mailbox contents during migration.

Create a job

  1. Login and open Dashboard.
  2. Fill in Source and Destination credentials.
  3. Click Migrate.
  4. If payment is required, you’ll see a Pay button on Dashboard.

How to find IMAP settings

You need your mailbox IMAP server (host), port and encryption type (SSL/TLS or STARTTLS). This information is provided by your email provider.

Fastest way: check your mail client

  • Thunderbird: Account Settings → Server Settings → Server Name (host), Port, Connection Security.
  • Outlook: File → Account Settings → Server Settings (or ask your provider; Outlook often hides IMAP details).
  • Apple Mail: Settings → Accounts → Server Settings.

Provider help pages

Search in Google: "IMAP settings" + your email domain/provider (example: IMAP settings example.com).

Typical values

  • IMAPS (SSL/TLS): port 993
  • IMAP + STARTTLS: port 143

Tip: In PostMaster we run a preflight IMAP login check before payment, so you’ll know immediately if the settings are wrong.

During migration

  • Dashboard updates automatically while a job is running.
  • You can open the Job page to see details and live log tail.
  • Migration can take a lot of time. You can browse other pages, close browser or even login from another computer to monitor migration or create Job.
  • If a job fails, check the log — common causes: wrong password, blocked IMAP, quota, TLS issues.

After completion

  • You will receive an email report with summary and download link for full log.
  • When the job completes successfully, we also include an invoice link.