I've compared these two files. There is no much difference. Here is the result of diff:
mail:~# diff dovecot22.conf /etc/dovecot/dovecot.conf
6c6
< listen = * [::]
---
> listen = *, [::]
8c8
< #base_dir = PH_BASE_DIR
---
> #base_dir = /var/run/dovecot
12c12
< protocols = PH_PROTOCOLS
---
> protocols = pop3 imap sieve lmtp
15,16c15,16
< mail_uid = PH_MAIL_UID
< mail_gid = PH_MAIL_GID
---
> mail_uid = 2000
> mail_gid = 2000
19,20c19,20
< first_valid_uid = PH_FIRST_VALID_UID
< last_valid_uid = PH_LAST_VALID_UID
---
> first_valid_uid = 2000
> last_valid_uid = 2000
23c23
< log_path = PH_LOG_PATH
---
> log_path = /var/log/dovecot.log
39,41c39,41
< #ssl_ca = </path/to/ca
< ssl_cert = <PH_SSL_CERT
< ssl_key = <PH_SSL_KEY
---
> #ssl_ca =</path/to/ca
> ssl_cert = </etc/ssl/certs/iRedMail.crt
> ssl_key = </etc/ssl/private/iRedMail.key
44c44
< ssl_cipher_list = PH_SSL_CIPHERS
---
> ssl_cipher_list = ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA
47,48c47,48
< #ssl_dh_parameters_length = 2048
< #ssl_prefer_server_ciphers = yes
---
> ssl_dh_parameters_length = 2048
> ssl_prefer_server_ciphers = yes
67c67
< auth_default_realm = PH_AUTH_DEFAULT_REALM
---
> auth_default_realm =
73,74c73,74
< # Default is 100. This can be overridden by `process_limit =` in
< # `service [protocol]` block.
---
> # Default is 100.
> # Note: this value can be overrided by "process_limit =" in service protocol.
83,85c83,85
< unix_listener PH_POSTFIX_CHROOT_DIR/private/dovecot-auth {
< user = PH_DOVECOT_AUTH_USER
< group = PH_DOVECOT_AUTH_GROUP
---
> unix_listener /var/spool/postfix/private/dovecot-auth {
> user = postfix
> group = postfix
89,90c89,90
< user = PH_AUTH_MASTER_USER
< group = PH_AUTH_MASTER_GROUP
---
> user = vmail
> group = vmail
94,95c94,95
< user = PH_AUTH_MASTER_USER
< group = PH_AUTH_MASTER_GROUP
---
> user = vmail
> group = vmail
103c103
< user = PH_AUTH_MASTER_USER
---
> user = vmail
115,117c115,117
< unix_listener PH_POSTFIX_CHROOT_DIR/private/dovecot-lmtp {
< user = PH_DOVECOT_AUTH_USER
< group = PH_DOVECOT_AUTH_GROUP
---
> unix_listener /var/spool/postfix/private/dovecot-lmtp {
> user = postfix
> group = postfix
122c122
< # Listen on localhost (ipv4)
---
> # Listen on localhost
130,131c130,131
< args = PH_USERDB_ARGS
< driver = PH_USERDB_DRIVER
---
> args = /etc/dovecot/dovecot-mysql.conf
> driver = sql
134,135c134,135
< args = PH_PASSDB_ARGS
< driver = PH_PASSDB_DRIVER
---
> args = /etc/dovecot/dovecot-mysql.conf
> driver = sql
146c146
< args = PH_DOVECOT_MASTER_USER_PASSWORD_FILE
---
> args = /etc/dovecot/dovecot-master-users
151c151
< auth_socket_path = PH_DOVECOT_AUTH_MASTER_PATH
---
> auth_socket_path = /var/run/dovecot/auth-master
153,155c153
< # Quota configuration.
< # Reference: http://wiki2.dovecot.org/Quota/Configuration
< quota = PH_QUOTA_TYPE
---
> quota = dict:user::proxy::quotadict
162d159
< #
165,180c162,164
< #
< # Only the command for the first exceeded limit is executed, so configure
< # the highest limit first.
< quota_warning = storage=100%% quota-warning 100 %u
< quota_warning2 = storage=95%% quota-warning 95 %u
< quota_warning3 = storage=90%% quota-warning 90 %u
< quota_warning4 = storage=85%% quota-warning 85 %u
<
< # allow user to become max 10% (or 50 MB) over quota
< quota_grace = 10%%
< #quota_grace = 50 M
<
< # Custom Quota Exceeded Message.
< # You can specify the message directly or read the message from a file.
< #quota_exceeded_message = Quota exceeded, please try again later.
< #quota_exceeded_message = </path/to/quota_exceeded_message.txt
---
> quota_warning = storage=85%% quota-warning 85 %u
> quota_warning2 = storage=90%% quota-warning 90 %u
> quota_warning3 = storage=95%% quota-warning 95 %u
199c183
< sieve = %Lh/sieve/PH_SIEVE_RULE_FILENAME
---
> sieve = %Lh/sieve/dovecot.sieve
202c186
< sieve_global_dir = PH_SIEVE_DIR
---
> sieve_global_dir = /var/vmail/sieve
208c192
< sieve_before = PH_GLOBAL_SIEVE_FILE
---
> sieve_before = /var/vmail/sieve/dovecot.sieve
211,217d194
< # The maximum number of redirect actions that can be performed during a
< # single script execution.
< # The meaning of 0 differs based on your version. For pigeonhole-0.3.0 and
< # beyond this means that redirect is prohibited. For older versions,
< # however, this means that the number of redirects is unlimited.
< #sieve_max_redirects = 4
<
226c203
< executable = script PH_QUOTA_WARNING_SCRIPT
---
> executable = script /usr/local/bin/dovecot-quota-warning.sh
228,229c205,206
< user = PH_QUOTA_WARNING_USER
< group = PH_QUOTA_WARNING_GROUP
---
> user = vmail
> group = vmail
237,238c214,215
< user = PH_SERVICE_DICT_USER
< group = PH_SERVICE_DICT_GROUP
---
> user = vmail
> group = vmail
244,245c221,222
< quotadict = PH_DOVECOT_REALTIME_QUOTA_SQLTYPE:PH_DOVECOT_REALTIME_QUOTA_CONF
< acl = PH_DOVECOT_SHARE_FOLDER_SQLTYPE:PH_DOVECOT_SHARE_FOLDER_CONF
---
> quotadict = mysql:/etc/dovecot/dovecot-used-quota.conf
> acl = mysql:/etc/dovecot/dovecot-share-folder.conf
251,252c228,229
< auth_socket_path = PH_DOVECOT_AUTH_MASTER_PATH
< log_path = PH_DOVECOT_SIEVE_LOG_FILE
---
> auth_socket_path = /var/run/dovecot/auth-master
> log_path = /var/log/dovecot-sieve.log
260c237
< info_log_path = PH_DOVECOT_LMTP_LOG_FILE
---
> info_log_path = /var/log/dovecot-lmtp.log
279c256
< mail_max_userip_connections = 30
---
> mail_max_userip_connections = 20
289c266
< mail_max_userip_connections = 30
---
> mail_max_userip_connections = 20
302a280
> #process_limit = $default_process_limit
317c295
< # Listen on localhost (ipv4)
---
> # Listen on localhost
330,333d307
< # Refer to document for more details about alias mailbox:
< # http://wiki2.dovecot.org/MailboxSettings
< #
< # Sent
337a312,313
> # This is an alias mailbox for "Sent".
> # Reference: http://wiki2.dovecot.org/MailboxSettings
342,345d317
< mailbox "Sent Items" {
< auto = no
< special_use = \Sent
< }
351,352d322
<
< # Trash
358,363d327
< mailbox "Deleted Messages" {
< auto = no
< special_use = \Trash
< }
<
< # Junk
367a332
> # Alias mailbox for "Junk".
371,384d335
< }
< mailbox "Junk E-mail" {
< auto = no
< special_use = \Junk
< }
<
< # Archive
< mailbox Archive {
< auto = subscribe
< special_use = \Archive
< }
< mailbox Archives {
< auto = no
< special_use = \Archive
