Hmailserver 5.7 — Download

After installation, you must configure the server before it can accept mail.

Before you run the installer, ensure your server is ready. A mail server is complex and requires specific environmental conditions: download hmailserver 5.7

Reverse DNS (PTR Record): Contact your ISP to set a PTR record for your IP. Many major email providers (Gmail, Outlook) will reject your emails if your IP does not match your domain name in a reverse lookup.

Antivirus Exclusions: You must exclude the hMailServer data directory and program directory from your on-access virus scanner (like Windows Defender), or the scanner will lock files and corrupt your database.

RFC compliance tab: Ensure "Allow empty sender address" is checked for bounce messages.

After downloading, always verify the SHA-256 hash to ensure file integrity. For version 5.7.0-B2614, the official hash is: After installation, you must configure the server before

e3c8a9f2b1d4c5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f

(Example – replace with actual hash from the official announcement) Reverse DNS (PTR Record): Contact your ISP to

Use PowerShell to check:
Get-FileHash .\hMailServer-5.7.0-B2614.exe

Even with a clean download, you may encounter these known quirks of version 5.7:

| Issue | Solution | |-------|----------| | "MySQL 8 authentication plugin incompatibility" | Change MySQL user to mysql_native_password OR compile 5.7 with caching_sha2 support. | | Service fails to start after install | Check C:\Program Files\hMailServer\Logs\error_log.txt. Often a database connection string issue. | | IMAP folders disappear | In Administrator, go to your domain > Advanced > IMAP Folders – recreate the default set (INBOX, Sent, Trash). | | Can't send to Gmail/Outlook | Ensure reverse DNS (PTR) record matches your server's IP. Also configure DKIM and SPF. |