Symptoms
Roundcube gives internal server errors, the lmtp service is down, and messages similar to the following appear in /var/log/maillog
.
Jun 1 13:16:18 server dovecot: lmtp(user@domain.tld)<458640><kWHRLJIbeGSQ/wYAoeKyhw>: Fatal: master: service(lmtp): child 458640 returned error 83 (Out of memory (service lmtp { vsz_limit=512 MB }, you may need to increase it) - set CORE_OUTOFMEM=1 environment to get core dump)
Description
Mailboxes with a large number of messages can cause the LMTP server to consume all of its allocated memory, which results in the service crashing. To correct this, the vsz_limit
value for the LMTP configuration needs to be increased.
Workaround
- Log into WHM as the 'root' user.
- Navigate to "Home / Service Configuration / Mailserver Configuration."
- Scroll down to the "Process Memory Limit for Mail (MB)" option.
- Set the "Process Memory Limit for Mail (MB)" option to the desired value.
- Scroll down to the bottom of the page.
- Click the "Save Changes" button.
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