Cannot restore Plesk backup on Almalinux 10: Fatal error: plesk::mail::postfix::PostfixConfigurationError(postmap: fatal: lmdb:/var/spool/postfix/plesk/virtual

Batyr Tarpakov

Updated January 07, 2026 08:02

kb: bug kb: fixed kb: technical

Applicable to:

Backup restore fails:

PLESK_ERROR: Internal server error: <cli><failure>mailmng-core failed: Fatal error: plesk::mail::postfix::PostfixConfigurationError(postmap: fatal: lmdb:/var/spool/postfix/plesk/virtual: internal error: mdb.c:2185: Assertion 'rc == 0' failed in mdb_page_dirty()
)</failure></cli>
Running plesk repair mail command doesn't fix the issue.
Unable to create a domain with error:

CONFIG_TEXT: Configuring mail
mailmng-core failed: Fatal error: plesk::mail::postfix::PostfixConfigurationError(unknown error)

The following error can also be observed during migration:

CONFIG_TEXT: Unable to create subscription 'example.com'.
An error occurred during domain creation: mailmng-core failed: Fatal error: plesk::mail::postfix::PostfixConfigurationError(unknown error)

Product issue:

#PPPM-15128 "Fixed the issue where the plesk repair mail command could not complete when the Postfix LMDB file is corrupted."
Fixed in:
- Plesk Obsidian 18.0.75 06 January 2026 (Linux)

Please consider updating your server:

If update is not possible for some reason you may try the following

workaround

As a workaround:

Connect to the server via SSH.
Move the broken database:

# mv /var/spool/postfix/plesk/virtual.lmdb /var/spool/postfix/plesk/virtual.lmdb.backup
Regenerate the database:

# plesk repair mail -y