root@server29:/usr/local/psa/bin# ./mailserver --help

Usage: mailserver command [options]

    Available commands:
    --set-relay        <closed|auth>   Sets relaying type.
    --set-max-letter-size <number>[B|K|M|G]
                                       Sets maximum letter size in bytes.
    --set-max-connections   <number>   Maximum number of connections (IMAP,
                                       POP3, IMAP over SSL/TLS, or POP3 over
                                       SSL/TLS)
    --set-max-connections-per-ip <number>
                                       Maximum number of connections (IMAP,
                                       POP3, IMAP over SSL/TLS, or POP3 over
                                       SSL/TLS) per IP address (for
                                       Courier-IMAP) or per IP address for a
                                       specific mail user (for Dovecot)
    --set-maps-status  <true|false>    Set MAPS spam protection status.
    --add-maps-zone <zone1>,<zone2>...<zoneN>
                                       Adds zone(s) to MAPS protection.(Comma
                                       separated list)
    --set-maps-zone <zone1>,<zone2>...<zoneN>
                                       Set zone(s) to MAPS protection.(Comma
                                       separated list)
    --remove-maps-zone <zone1>,<zone2>...<zoneN>
                                       Removes zone(s) from MAPS
                                       protection.(Comma separated list)
    --set-account-type <full|both>     Allows short and full POP3/IMAP mail
                                       accounts (both), or only full (full)
    --use-vocabulary   <true|false>    Sets the requirement for the minimum
                                       password strength.
    --add-to-black-list <domains list> Adds domain or domains list (comma
                                       separated) to black list
    --remove-from-black-list <domains list>
                                       Removes domain or domains list (comma
                                       separated) from black list
    --add-to-white-list <ip_addresses/net_masks list>
                                       Adds pair ip_address/net_mask or
                                       ip_addresses/net_masks list (comma
                                       separated) to white list.
    --remove-from-white-list <ip_addresses/net_masks list>
                                       Removes pair ip_address/net_mask or
                                       ip_addresses/net_masks list (comma
                                       separated) from white list.
    --add-extra-auto-reply-header
"<header1_name>:<header1_value>" "<header2_name>:<header2_value>" ...
                                       Adds extra auto-reply headers
                                       ('name:value' arguments).
    --remove-extra-auto-reply-header "<header1_name>" "<header2_name>" ...
                                       Removes extra auto-reply headers
                                       ('name' arguments).
    --set-virusfilter  <none>          Set used antivirus on the server
    --update-spf                       Update SPF (Sender Policy Framework)
                                       properties.
    --set-message-submission <true|false>
    --verify-incoming-mail <true|false>
                                       DKIM spam protection. Turns on/off
                                       checking of incoming mail
    --update-webmail <atmail|horde|roundcube>
                                       Available webmail clients. Turns
                                       on/off selected webmail client
    --info or -i <options|black-list|white-list|spf|webmails>
                                       Shows options or black/white list or
                                       spf properties or available webmail
                                       clients.
    --clean-mail-queue                 Removes all the messages from the mail
                                       queue.
    --help or -h                       Displays this help page
    --email-subaddressing-enable <true|false>
                                       This option enables an ability to
                                       configure VERP-style email addresses
                                       for mail lists
    --add-external-webmail             Registers an additional webmail
                                       service. Required options:
                                       webmail-name and webmail-url.
    --update-external-webmail <webmail name>
                                       Updates settings of an additional
                                       webmail service.
    --remove-external-webmail <webmail name>
                                       Removes registration of an additional
                                       webmail service.
    --update-smtp-settings             Updates the external SMTP server
                                       settings
    --enable-outgoing-antispam         Switches on limits on outgoing email
                                       messages.
    --disable-outgoing-antispam        Switches off limits on outgoing email
                                       messages.
    --set-outgoing-messages-mbox-limit <number>
                                       Sets the maximum number of outgoing
                                       messages from a mailbox (per hour).
    --set-outgoing-messages-domain-limit <number>
                                       Sets the maximum number of outgoing
                                       messages from a domain (per hour).
    --set-outgoing-messages-subscription-limit <number>
                                       Sets the maximum number of outgoing
                                       messages from a subscription (per
                                       hour).
    --set-outgoing-messages-enable-sendmail <true|false>
                                       Turns Linux Sendmail for PHP scripts
                                       on or off. Scripts will be able to
                                       send mail even when the limits on
                                       outgoing messages are reached for the
                                       corresponding mailbox and domain.
    --set-outgoing-messages-fix-sender <true|false>
                                       Fix incorrectly set sender for
                                       outgoing mail. Automatically set valid
                                       email headers and sender envelope
                                       address for outgoing mail from domains
                                       to reduce chances of being treated as
                                       spam.
    --set-outgoing-messages-count-recipients <true|false>
                                       Count recipients rather than messages
                                       when limiting outgoing mail and
                                       counting statistics.
    --set-outgoing-messages-report-period <P1D|P1W|P2W|P1M>
                                       Sets the period of time for the alert
                                       on the Home page about attempts to
                                       exceed limits on outgoing mail (the
                                       last day, week, two weeks, or month).
    --set-outgoing-messages-notification-period <PT15M|PT1H|PT6H|PT12H|P1D>
                                       Sets the period of time for email
                                       notifications about attempts to exceed
                                       limits on outgoing mail.
    --set-outgoing-email-mode <domain-ip|domain-name|explicit-ip>
    --set-certificate <certificate-name>
                                       The name of the certificate to secure
                                       the mail server.
    --sign-outgoing-mail <true|false>  DKIM spam protection. Turns on/off
                                       signing of outgoing mail.
    --enable-dmarc                     DMARC spam protection. Turns on DMARC
                                       validation for incoming mail.
    --disable-dmarc                    DMARC spam protection. Turns off DMARC
                                       validation for incoming mail.
    --quota-warning-enable <true|false>
                                       Send a notification to mail users when
                                       their mailbox quota usage exceeds 95%
    --set-mail-autodiscover <true|false>
                                       Turns Mail Autodiscover on/off
    --set-mail-autodiscover-domain-name <domain>
                                       Specify a custom domain name for mail
                                       autodiscover. Custom domain name can
                                       be unset by specifying empty string
    --configure-smarthost              Configures a smarthost.
    --enable-smarthost                 Enables sending mail through the
                                       smarthost.
    --disable-smarthost                Disables sending mail through the
                                       smarthost.

    Available options:
    -auth-type    <pop3|smtp|both>     Types of authorization(required for
                                       --set-relay auth).
    -lock-time         <time>          Sets lock time for 'pop3' or 'both'
                                       authorization types. Min.
    -spf-status        <true|false>    Enables or disables SPF spam
                                       protection.
    -spf-behavior      <spf_behavior>  Sets the behavior of SPF.(From 1 to
                                       6).
    -spf-ignore-dns-error <true|false> Enables or disables ignoring of DNS
                                       errors.
    -spf-rules         <spf_rules>     Sets SPF rules which will be carried
                                       out if SPF check will return
                                       fail,softfail or neutral.
    -spf-guess         <spf_guess>     Sets SPF rules which will be carried
                                       out for domains which are not
                                       publishing SPF records.
    -spf-exp           <spf-exp>       Sets the line which will receive the
                                       sender (SMTP client), if the letter
                                       will be rejected by result of SPF
                                       check.
    -state             <true|false>    Enables or disables selected webmail
                                       client.
    -webmail-name      <webmail name>  Webmail service name.
    -webmail-url       <webmail url>   Webmail service URL.
    -webmail-status <enabled|disabled> Webmail service availability.
    -mail-notifications  <true|false>  Enables Plesk to send email
                                       notifications through the specified
                                       SMTP server (used with the
                                       --update-smtp-settings command)
    -smtp-host         <domain|ip>     Sets the host name or IP address of
                                       the external SMTP server (used with
                                       the --update-smtp-settings command)
    -smtp-port         <port>          Sets the port for the external SMTP
                                       server (used with the
                                       --update-smtp-settings command)
    -smtp-login        <login_name>    Sets the username for accessing the
                                       external SMTP server (used with the
                                       --update-smtp-settings command)
    -smtp-password     <pasword>       Sets the password for accessing the
                                       external SMTP server (used with the
                                       --update-smtp-settings command)
    -smtp-tls          <true|false>    The external SMTP server requires
                                       encrypted connections (used with the
                                       --update-smtp-settings command)
    -smtp-allow-users  <true|false>    Allows users' scripts to send mail
                                       through the external SMTP server (used
                                       with the --update-smtp-settings
                                       command, username and password should
                                       be specified)
    -explicit-ipv4     <IPv4 address>
    -explicit-ipv6     <IPv6 address>
    -certificate-repository <domain-name>
                                       The domain where the certificate
                                       repository is located (server
                                       repository by default)
    -reconfigure-dns   <true|false>    Reconfigure autodiscover DNS records
    -smarthost-host    <ip|hostname>   Specifies the smarthost hostname or IP
                                       address.
                                       Applies to:
                                       --configure-smarthost

    -smarthost-port    <number>        Specifies the smarthost port number.
                                       Applies to:
                                       --configure-smarthost

    -smarthost-user    <username>      Specifies the smarthost username. The
                                       smarthost password must be set via the
                                       'PSA_PASSWORD' environment variable.
                                       To turn off authentication, specify an
                                       empty username value.
                                       Applies to:
                                       --configure-smarthost

    -smarthost-encryption   <on|off>   Specifies the connection encryption
                                       mode.
                                       Applies to:
                                       --configure-smarthost


Version: 18.0.64_build1800241008.13 os_Ubuntu 22.04

root@server29:/usr/local/psa/bin#
lrwxrwxrwx 1 root root 36 Oct  8 13:10 mailserver -> ../admin/plib/api-cli/mailserver.php
-rwxr-xr-x 1 root root 361 Oct  8 13:10 /usr/local/psa/admin/plib/api-cli/mailserver.php


root@server29:/usr/local/psa/bin# ./mailserver --info options
POP3 authorization: off
SMTP authorization: on
Enable MAPS spam protection: off
MAPS zones:
Short POP3/IMAP mail account names: off
Check the passwords in the dictionary: on
Maximum letter size: 10240000
Extra auto-reply headers:
The maximum number of connections (IMAP, POP3, IMAP over SSL/TLS, or POP3 over SSL/TLS).: 1024
The maximum number of connections (IMAP, POP3, IMAP over SSL/TLS, or POP3 over SSL/TLS) per IP address for a specific mail user.: 10
Outgoing mail mode: domain-name
VirusFilter: none
Limits on outgoing email messages: on
Count the number of recipients instead of messages: off
The number of outgoing messages from a mailbox (per hour).: 10
The number of outgoing messages from a domain (per hour).: 50
The number of outgoing messages from a subscription (per hour).: 100
Turn on Linux Sendmail for PHP scripts: on
Show the alert on the Home page about attempts to exceed limits based on statistics for the last: P1W
Send a notification about attempts to exceed limits on outgoing mail every: PT1H
Relaying: auth
DMARC Policy: on
DKIM Sign Outgoing Mail: on
DKIM Verify Incoming Mail: on
Certificate:    default certificate
Mail Autodiscover: off