==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 0.9.9
- Deployed with iRedMail Easy or the downloadable installer : Downloadable installer
- Linux/BSD distribution name and version: Ubuntu 18
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Web server (Apache or Nginx):NGINX
- Manage mail accounts with iRedAdmin-Pro?No
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

Hi we are unable to see the mails in the webmail (roundcube), Also i am getting error configuring that email id in the email client..

Please find the logs generated below in pop3 log :

Apr 13 11:25:34 mailnm dovecot: imap(e-contract@xyz.in): Error: Raw backtrace: /usr/lib/dovecot/libdovecot.so.0(+0xa0a22) [0x7ff8d64e2a22] -> /usr/lib/dovecot/libdovecot.so.0(+0xa0b1a) [0x7ff8d64e2b1a] -> /usr/lib/dovecot/libdovecot.so.0(i_error+0) [0x7ff8d6472352] -> /usr/lib/dovecot/libdovecot.so.0(+0xbccf4) [0x7ff8d64fecf4] -> /usr/lib/dovecot/libdovecot.so.0(+0xbcd30) [0x7ff8d64fed30] -> /usr/lib/dovecot/libdovecot.so.0(p_strdup+0x28) [0x7ff8d650fa68] -> /usr/lib/dovecot/libdovecot-storage.so.0(maildir_uidlist_refresh+0x560) [0x7ff8d67ee9a0] -> /usr/lib/dovecot/libdovecot-storage.so.0(+0x7b3e8) [0x7ff8d67ef3e8] -> /usr/lib/dovecot/libdovecot-storage.so.0(maildir_uidlist_sync_init+0x125) [0x7ff8d67ef935] -> /usr/lib/dovecot/libdovecot-storage.so.0(+0x77529) [0x7ff8d67eb529] -> /usr/lib/dovecot/libdovecot-storage.so.0(+0x779f2) [0x7ff8d67eb9f2] -> /usr/lib/dovecot/libdovecot-storage.so.0(maildir_storage_sync_init+0xc3) [0x7ff8d67ebd73] -> /usr/lib/dovecot/libdovecot-storage.so.0(mailbox_sync_init+0x44) [0x7ff8d67bf704] -> /usr/lib/dovecot/libdovecot-storage.so.0(mailbox_sync+0x37) [0x7ff8d67bf7a7] -> dovecot/imap(cmd_select_full+0x17e) [0x5610c9edeabe] -> dovecot/imap(command_exec+0x5c) [0x5610c9ee5e8c] -> dovecot/imap(+0x1b3c2) [0x5610c9ee43c2] -> dovecot/imap(+0x1b45c) [0x5610c9ee445c] -> dovecot/imap(client_handle_input+0x18d) [0x5610c9ee481d] -> dovecot/imap(client_input+0xac) [0x5610c9ee4d6c] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_call_io+0x52) [0x7ff8d64f8ac2] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run_internal+0x12e) [0x7ff8d64fa16e] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run+0x36) [0x7ff8d64f8b56] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_run+0x38) [0x7ff8d64f8d08] -> /usr/lib/dovecot/libdovecot.so.0(master_service_run+0x13) [0x7ff8d647ca83] -> dovecot/imap(main+0x329) [0x5610c9ed7179] -> /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7) [0x7ff8d6072b97] -> dovecot/imap(_start+0x2a) [0x5610c9ed730a]
Apr 13 11:25:34 mailnm dovecot: imap(e-contract@xyz.in): Fatal: master: service(imap): child 22835 returned error 83 (Out of memory (service imap { vsz_limit=256 MB }, you may need to increase it) - set CORE_OUTOFMEM=1 environment to get core dump)

Mailbox size is 6.6GB

I have tried increasing vsz_limit in dovecot.conf file upto 8000MB, still i am getting this error.

Please help me to solve this issue