dying on osx

OSX 10.13.6 High Sierra, dovecot 2.3.2.1

dovecot starts up and runs but dies as soon as my mail client makes a request with log and config below.

And advice appreciated.

Thanks

Mike

20180810-083730 auth: Debug: auth client connected (pid=77432)

20180810-083730 auth: Debug: client in: AUTH    1    PLAIN service=imap    secured    session=xo1p2BRzZNd/AAAB lip=127.0.0.1    rip=127.0.0.1    lport=143    rport=55140 20180810-083730 auth: Debug: client passdb out: CONT    1 20180810-083730 auth: Debug: client in: CONT    1 AG1rbQBta20xMjM= (previous base64 data may contain sensitive data) 20180810-083730 auth: Debug: static(mkm,127.0.0.1,): lookup 20180810-083730 auth: Debug: client passdb out: OK    1 user=mkm    host=localhost    nopasswd=y 20180810-083730 auth: Debug: master in: REQUEST    4201906177 77432    1    b8126b4b71be2959fc7716888eccc566 session_pid=77433    request_auth_token 20180810-083730 auth-worker(77426): Debug: passwd(mkm,127.0.0.1,): lookup 20180810-083730 auth: Debug: master userdb out: USER 4201906177    mkm    system_groups_user=mkm    uid=503 gid=20    home=/Users/mkm auth_token=4d2bb44168df3d63e4e1bb352e59de632bc7da49 20180810-083730 imap-login: Info: Login: user=<mkm>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=77433, secured, session= 20180810-083730 imap(mkm)<77433>: Fatal: setgroups(505) failed: Too many extra groups

# doveconf -n # 2.3.2.1 (0719df592): /usr/local/etc/dovecot/dovecot.conf # OS: Darwin 17.7.0 x86_64 # Hostname: pine auth_debug = yes auth_debug_passwords = yes default_internal_user = _dovecot default_login_user = _dovenull disable_plaintext_auth = no listen = 127.0.0.1 log_path = /var/log/dovecot log_timestamp = "%Y%m%d-%H%M%S " mail_debug = yes mail_gid = staff mail_location = mbox:~/Mail:INBOX=/var/mail/%u mail_privileged_group = mail mail_uid = _dovecot passdb { args = password=*** host=localhost nopasswd=y driver = static } passdb { args = login driver = pam } protocols = imap service auth { user = root } service imap-login { inet_listener imap { address = * port = 143 } } ssl = no userdb { driver = passwd }