I have quotas setup on a test domain to try everything out before I move my domains email over to dovecot.  I have a trash quota rule that should have added 100M to trash folder specifically, but mail was denied due to quota being full even though the only mail in the test account was in trash.  Below are debug log lines and dovecot -n output.

Oct 07 17:16:03 lmtp(26801): Debug: none: root=, index=, indexpvt=, control=, inbox=, alt= Oct 07 17:16:03 lmtp(26801): Info: Connect from local Oct 07 17:16:03 lmtp(26801): Debug: Loading modules from directory: /usr/lib64/dovecot Oct 07 17:16:03 lmtp(26801): Debug: Module loaded: /usr/lib64/dovecot/lib10_quota_plugin.so Oct 07 17:16:03 lmtp(26801): Debug: Module loaded: /usr/lib64/dovecot/lib20_autocreate_plugin.so Oct 07 17:16:03 lmtp(26801): Debug: Module loaded: /usr/lib64/dovecot/lib90_sieve_plugin.so Oct 07 17:16:03 lmtp(26801): Debug: auth input: 123@testdo.com home=/home/vmail/testdo.com/123 mail=maildir:/home/vmail/testdo.com/123 uid=2000 gid=2000 quota_rule=*:storage=20000 Oct 07 17:16:03 lmtp(26801): Debug: Added userdb setting: mail=maildir:/home/vmail/testdo.com/123 Oct 07 17:16:03 lmtp(26801): Debug: Added userdb setting: plugin/quota_rule=*:storage=20000 Oct 07 17:16:03 lmtp(26801, 123@testdo.com): Debug: Effective uid=2000, gid=2000, home=/home/vmail/testdo.com/123 Oct 07 17:16:03 lmtp(26801, 123@testdo.com): Debug: Quota root: name=User quota backend=dict args=:proxy::quotadict Oct 07 17:16:03 lmtp(26801, 123@testdo.com): Debug: Quota rule: root=User quota mailbox=* bytes=20480000 messages=0 Oct 07 17:16:03 lmtp(26801, 123@testdo.com): Debug: Quota rule: root=User quota mailbox=Trash bytes=+104857600 messages=0 Oct 07 17:16:03 lmtp(26801, 123@testdo.com): Debug: Quota grace: root=User quota bytes=2048000 (10%) Oct 07 17:16:03 lmtp(26801, 123@testdo.com): Debug: dict quota: user=123@testdo.com, uri=proxy::quotadict, noenforcing=0 Oct 07 17:16:03 lmtp(26801, 123@testdo.com): Debug: Namespace inbox: type=private, prefix=, sep=, inbox=yes, hidden=no, list=yes, subscriptions=yes location=maildir:/home/vmail/testdo.com/123 Oct 07 17:16:03 lmtp(26801, 123@testdo.com): Debug: maildir++: root=/home/vmail/testdo.com/123, index=, indexpvt=, control=, inbox=/home/vmail/testdo.com/123, alt= Oct 07 17:16:03 lmtp(26801, 123@testdo.com): Debug: sieve: Pigeonhole version 0.4.2 initializing Oct 07 17:16:03 lmtp(26801, 123@testdo.com): Debug: OFqmG0Nu2VmxaAAAobcTNA: sieve: using the following location for user's Sieve script: /home/vmail/testdo.com/123/.dovecot.sieve;name=main script Oct 07 17:16:03 lmtp(26801, 123@testdo.com): Debug: OFqmG0Nu2VmxaAAAobcTNA: sieve: loading script /home/vmail/testdo.com/123/.dovecot.sieve;name=main script Oct 07 17:16:03 lmtp(26801, 123@testdo.com): Debug: OFqmG0Nu2VmxaAAAobcTNA: sieve: script binary /home/vmail/testdo.com/123/.dovecot.svbin is not up-to-date Oct 07 17:16:03 lmtp(26801, 123@testdo.com): Debug: OFqmG0Nu2VmxaAAAobcTNA: sieve: script `main script' from /home/vmail/testdo.com/123/.dovecot.sieve;name=main script successfully compiled Oct 07 17:16:03 lmtp(26801, 123@testdo.com): Debug: OFqmG0Nu2VmxaAAAobcTNA: sieve: executing script from /home/vmail/testdo.com/123/.dovecot.sieve;name=main script Oct 07 17:16:03 lmtp(26801, 123@testdo.com): Info: OFqmG0Nu2VmxaAAAobcTNA: sieve: msgid=<3a1e5ba2-f0a7-4cec-e7fb-bf5202c2152d@keagaming.com>: failed to store into mailbox 'INBOX': Quota exceeded (mailbox for user is full)

# 2.2.10: /etc/dovecot/dovecot.conf # OS: Linux 3.10.0-514.26.2.el7.x86_64 x86_64 CentOS Linux release 7.4.1708 (Core)  xfs auth_mechanisms = plain login dict { quotadict = mysql:/etc/dovecot/dovecot-dict-quota.conf } first_valid_uid = 2000 hostname = testdo.com last_valid_uid = 2000 log_path = /var/log/dovecot.log mail_debug = yes mail_gid = vmail mail_location = maildir:/home/vmail/%d/%n mail_plugins = " quota trash expire" mail_privileged_group = mail mail_uid = vmail managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date ihave mbox_write_locks = fcntl namespace inbox { inbox = yes location = mailbox Drafts { auto = subscribe special_use = \Drafts } mailbox Junk { auto = subscribe special_use = \Junk } mailbox Sent { auto = subscribe special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { auto = subscribe special_use = \Trash } prefix = } passdb { args = /etc/dovecot/dovecot-sql.conf.ext driver = sql } plugin { quota = dict:User quota::proxy::quotadict quota_grace = 10%% quota_rule2 = Trash:storage=+100M quota_status_nouser = DUNNO quota_status_overquota = 552 5.2.2 Mailbox is full quota_status_success = DUNNO sieve_dir = ~/sieve sieve_global_dir = /etc/dovecot/sieve/global/ sieve_global_path = /etc/dovecot/sieve/default.sieve trash = /etc/dovecot/dovecot-trash.conf.ext } postmaster_address = administrator@testdo.com protocols = imap lmtp sieve service auth-worker { user = vmail } service auth { unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0666 user = postfix } unix_listener auth-client { group = postfix mode = 0660 user = postfix } unix_listener auth-master { group = vmail mode = 0660 user = vmail } unix_listener auth-userdb { mode = 0600 user = vmail } user = dovecot } service dict { unix_listener dict { group = vmail mode = 0600 user = vmail } } service imap-login { inet_listener imap { port = 143 } } service lmtp { executable = lmtp -L unix_listener /var/spool/postfix/private/dovecot-lmtp { group = postfix mode = 0600 user = postfix } } service managesieve-login { inet_listener sieve { port = 4190 } } service pop3-login { inet_listener pop3 { port = 110 } } ssl_cert = </etc/pki/dovecot/certs/dovecot.pem ssl_key = </etc/pki/dovecot/private/dovecot.pem userdb { args = /etc/dovecot/dovecot-sql.conf.ext driver = sql } protocol lmtp { info_log_path = /var/log/dovecot-lmtp.log log_path = /var/log/dovecot-lmtp-errors.log mail_plugins = " quota trash expire autocreate sieve quota" postmaster_address = postmaster@testdo.com } protocol sieve { info_log_path = /var/log/dovecot-sieve.log log_path = /var/log/dovecot-sieve-errors.log managesieve_implementation_string = dovecot managesieve_max_line_length = 65536 } protocol imap { mail_plugins = " quota trash expire imap_quota notify quota" } protocol pop3 { mail_plugins = " quota trash expire quota" }

Any help is appreciated, thanks.