cat /var/log/mail.log | grep "Out of memory"
Jun 28 11:48:24 server1 dovecot: master: Error: service(auth): child 31301 returned error 83 (Out of memory (service auth { vsz_limit=128 MB }, you may need to increase it))
Jun 28 11:50:18 server1 dovecot: auth: Fatal: pool_system_realloc(8192): Out of memory
Jun 28 11:50:18 server1 dovecot: master: Error: service(auth): child 10782 returned error 83 (Out of memory (service auth { vsz_limit=128 MB }, you may need to increase it))
Jun 28 11:52:43 server1 dovecot: master: Error: service(auth): child 16854 returned error 83 (Out of memory (service auth { vsz_limit=128 MB }, you may need to increase it))
Jun 28 11:54:01 server1 dovecot: auth: Fatal: block_alloc(4096): Out of memory
Jun 28 11:54:01 server1 dovecot: master: Error: service(auth): child 23378 returned error 83 (Out of memory (service auth { vsz_limit=128 MB }, you may need to increase it))
Jun 28 11:55:09 server1 dovecot: auth: Fatal: pool_system_realloc(8192): Out of memory
Jun 28 11:55:09 server1 dovecot: master: Error: service(auth): child 28203 returned error 83 (Out of memory (service auth { vsz_limit=128 MB }, you may need to increase it))
Jun 28 11:56:07 server1 dovecot: master: Error: service(auth): child 32570 returned error 83 (Out of memory (service auth { vsz_limit=128 MB }, you may need to increase it))
Jun 28 11:57:01 server1 dovecot: auth: Fatal: block_alloc(4096): Out of memory
Jun 28 11:57:01 server1 dovecot: master: Error: service(auth): child 5136 returned error 83 (Out of memory (service auth { vsz_limit=128 MB }, you may need to increase it))
Jun 28 11:57:57 server1 dovecot: master: Error: service(auth): child 9245 returned error 83 (Out of memory (service auth { vsz_limit=128 MB }, you may need to increase it))
Jun 28 11:58:52 server1 dovecot: master: Error: service(auth): child 13779 returned error 83 (Out of memory (service auth { vsz_limit=128 MB }, you may need to increase it))
Jun 28 11:59:49 server1 dovecot: master: Error: service(auth): child 18260 returned error 83 (Out of memory (service auth { vsz_limit=128 MB }, you may need to increase it))
Jun 28 12:01:03 server1 dovecot: auth: Fatal: pool_system_realloc(8192): Out of memory
Jun 28 12:01:03 server1 dovecot: master: Error: service(auth): child 22181 returned error 83 (Out of memory (service auth { vsz_limit=128 MB }, you may need to increase it))
Jun 28 12:03:24 server1 dovecot: auth: Fatal: pool_system_malloc(3144): Out of memory
Jun 28 12:03:24 server1 dovecot: master: Error: service(auth): child 27253 returned error 83 (Out of memory (service auth { vsz_limit=128 MB }, you may need to increase it))