# Email

# Imunify Email compatibility

Imunify Email has been checked for compatibility with following tools and mail gateways:

• Config Server Services
  • MailScanner
  • Firewall
• MailChannels from IE 0.6 version
• SpamAssassin (incoming and outgoing configuration)
• Smtp2go

# Installation

Imunify Email is simple to install.

At the moment, it runs on the following distributions:

• CentOS 7,8 with support of cPanel/WHM control panel.
• CloudLinux OS 7,8 with support of cPanel/WHM control panel.
• AlmaLinux 8 with support of cPanel/WHM control panel.

Minimum system requirements for installation:

• x64 | 512 Mb** | 20 Gb disk space ***

To install Imunify360, open an SSH connection to your server using your preferred SSH console application. You will need to have the root level access in order to proceed.

To start installation, run the following script with your activation key:

wget https://repo.imunify360.cloudlinux.com/defence360/imunifyemail-deploy.sh
bash imunifyemail-deploy.sh

# Installation details

# Users created

During installation, the following users will be created:

• _rspamd
• _imunifyemail

The _imunifyemai user will also be added to the _imunify group.

# Directories

Imunify Email has following components:

• Imunify RSpamd
• Imunify Quarantine

Imunify RSpamd acts as an email filter and is installed in system directories such as:

• /etc/rspamd
• /usr/bin
• /usr/lib
• /usr/share/rspamd

Imunify Quarantine is installed in the following directory: /var/imunifyemail/quarantine.

# Quarantine directories

Imunify Quarantine component keeps all quarantine content, including emails and meta data in the following directory: /var/imunifyemail/quarantine/storage/.

# Exim configuration modifications

Imunify Email modifies Exim MTA configuration, adding RSpamd as a filter for email. It is done automatically during installation. In case if filtering needs to be disabled, see Disable Imunify Email. When disabled, Exim configuration will not contain an RSpamd filter. To re-able Imunify Email, see Enable Imunify Email.

The configuration change is compatible with WHM Advanced Editor, you can continue using it for other modifications.

# User interface access

In order to access the UI as a hosting administrator, navigate to WHM -> Plugins -> Imunify360 -> Email tab.

Your clients will be able to access the Imunify Email Quarantine under: cPanel -> Security -> Imunify360 -> Email.

# Managing Imunify Email

# Check Imunify Email version

To find out which version of Imunify Email is installed, run the following command as root:

ie-config version

# Check status

In order to check status of Imunify Email, run the following command as root:

ie-config status

# Disable Imunify Email

In order to disable Imunify Email, run following command as root:

ie-config disable

It will remove filter configuration and stop Imunify Email services.

# Enable Imunify Email

If Imunify Email was installed, but then disabled it can be re-enabled using the following command, run as root:

ie-config enable

# WHM user interface

Imunify Email scans the outbound emails on the server and allows to identify viral mailings and other viral outbound mail content for all accounts on the server.

Click Email in the main menu of the Imunify360 admin interface.

The following tabs are available:

• Quarantine
• Activity Monitor
• Settings

# Quarantine

Go to Imunify360 → Email → Quarantine tab. Here, there are emails that are considered viral or malicious for all accounts on the server. You can decline or confirm the Imunify Email decision and either release and send emails or remove them completely.

The table has the following columns:

• Account — account name

• Received Date — when an email was received by the server for sending

• Reasons — the reason why message has been quarantined

  • spam — means that a message has been classified as a spam
  • winexec — means that a message contains windows executable attachments (you can allow that using ie-cli)
  • ratelimit — means that a message exceeded a limit per hour for one of the Account/Domain/Sender email/Script. You might adjust the limit using the "Activity Monitor" tab.

• Sender (From) — the user who sent the email

• Recipients — recipients (including CC and BCC)

• Subject — a subject from an email

• Actions

  • Release & Send — hosting admin can use multi-select and release & send several emails at once

  

  • Delete — delete email permanently

    

  • View Email — view email content

    

    • Body - decoded email content with tags removed
    • Header - email Headers section
    • Plain text - headers plus original email body

# Activity Monitor and Sender limits

Go to Imunify360 → Email → Activity Monitor. Activity Monitor provides a way to observe, control and regulate the flow of mail. From this tab the messages can be whitelisted or chosen to be explored in the Quarantine tab.

The table lists the following columns:

• Sender Object - a set of origination information that can be identified about an email is shown here. The four possible categories are:
  • WHM account
  • Domain
  • PHP Script (able to send an email)
  • Email address of a user
• Ham/Sent out - quantity of a non-spam emails that were sent out is shown corresponding to a Sender Object in a first column.
• Limit - the number of emails that corresponding Sender Object will be allowed to send out in a space of one hour. This number turns red and a warning sign is displayed as soon as the limit is exceeded.
• Whitelisted - the records in this column only have two states "true" and "false" and show if the whitelisting is on or off for a particular Sender Object.
• Quarantined - reflects emails from a particular Sender Object and their quantity.
• Actions - several actions to perform on a particular Sender Object are available:
  • Go to quarantine allows to explore a particular Sender Object in a Quarantine tab.
  • Update sender limit allows to enable/disable granular limits for a particular Sender Object that override limits set in the Settings tab.
  • Whitelist sender allows to remove any limit on sending out emails for a particular Sender Object.

The Timeframe setting for the records visible in the table can be chosen from the following options under the Timeframe button.

Records in the table are searchable and the parameters of the search can be narrowed down by using the Account name, Sender address, Domain, and Script filters.

# Sender limits

This is the second level of control for sender limits. Limits set for a particular Sender Object here override the limits set on the previous stage.

Go to Imunify360 → Email → Activity Monitor → Actions → Update sender limit. For a particular Sender Object the limit can be switched on and off. The limit value can be set higher or lower than the value in the Setting tab. This setting is aimed at providing a way to set needed exceptions from the general rules.

# Whitelisting

This is the third level of control for sender limits. Limits set via this control override the limits set at the two the previous stages. Go to Imunify360 → Email → Activity Monitor → Actions → Whitelist sender. A particular Sender Object can be whitelisted, which means that the Sender limits will no longer be applied to this Sender Object - so it will be able to send out an unlimited number of messages. Only the domain and email of the user Sender Objects can be whitelisted, WHM account and PHP script cannot be whitelisted.

To confirm whitelisting for a particular Sender Object click Yes, add to whitelist.

# Settings

Go to Imunify360 → Email → Settings tab. The settings allow managing the space for quarantine and setting up limits for sending out the messages(set up a rate-limit) for all the Sender Objects adopts a 3-tier approach that is aimed to provide granular control over the outgoing messages to the administrator. An administrator can increase or decrease the space for the user's quarantine. If all space is consumed, the oldest emails in quarantine will be permanently deleted.

# Activity Monitor Settings

This is the first level of control for sender limits. The values set at this level will be default for an entire server and will be applied by default to all Sender Objects. Go to Imunify360 → Email →Settings tab. Here, set a limit on the number of emails that can be sent by a particular entity - WHM account, domain, PHP Script, or email address of a user.

• The limit is set for the number of messages within the space of the last 60 minutes.
• The limits can be applied either to a number of emails or a number of recipients.

Once the values are chosen, press Save Changes to apply them.

# Quarantine Settings

The table has the following columns:

• Account — user account name

• Limit (MB) — the space for the user's quarantine limit (default is 100 MB)

• Used Space (MB) — the space used by files in quarantine (slight excess of the limit is possible)

• State — the state of the user's quarantine.

• Details — emails deleted permanently for the last hour

• Actions

  • Purge quarantine — purge all quarantine for an account

    

  • Add — change the limit of the space for the user's (account) quarantine

  

# Imunify Email Command Line Interface

The Command Line Interface (CLI) is designed to simplify usage of Imunify Email and as an enabler for integration with other tools and platforms.

Main command for all operations with Imunify Email:

ie-cli 

# Basic usage

Imunify Email quarantine CLI application

Usage:

ie-cli [command] [arguments]

Use --help key to get list of the available commands and to get help for the particular command, e.g. ie-cli whitelist sender --help .

Available Commands:

Flags:

# Operations with emails in the quarantine

Emails marked as spam by Imunify Email are stored in the quarantine. The following section describes CLI for operating with emails.

# List emails in quarantine

In order to see all emails stored use the following command. By default 'root' account is used, so the command shows the whole content of the quarantine.

Command

ie-cli emails list -a <ACCOUNT_NAME> [--json]

Example

ie-cli emails list -a root

Output

-----------------------------------------------------------------------------------------------------------
Email_ID ef69f707-d547-4b29-b8f0-f5331821c930 
Size_Bytes	      8190 
Account_Name	  mws 
Recipients	      me@somehost.com
Subject        	  Ge t G:eneric V1agra f:or as 1ow as $2.50 per 50 mg

----------------------------------------------------------------------------------------------------------
Email_ID faf96a73-5be4-481a-9c6c-7ab8fb2e3cf0 
Size_Bytes	      8534 
Account_Name	  mws 
Recipients	      frank@yahooo.com
Subject           FWD: Want Pills V|AgR@ % Xan_a_x ^ Valiu|m| # At|v@`n \ Pn+ermin ' So+m+a  lNmAL

-----------------------------------------------------------------------------------------------------------
Email_ID fbc2efd0-1808-4e54-99ce-3082708b28ee 
Size_Bytes	      8971 
Account_Name	  oregdent 
Recipients	      steve@hillcabinet.com
Subject        	  FWD:Xanax.x Valium.m Xanax.x Vicodin.n h ogzmwggi

-----------------------------------------------------------------------------------------------------------
Max Count	     3

Example with JSON as output format

ie-cli emails list -a root –-json

Output

{
  "items": [
    {
      "email_id": "ef69f707-d547-4b29-b8f0-f5331821c930",
      "size_bytes": 8190,
      "account_name": "mws",
      "recipients": [
        "me@somehost.com"
      ],
      "subject": "Ge t G:eneric V1agra f:or as 1ow as $2.50 per 50 mg",
      "script_header": {
        "raw": "",
        "domain": "",
        "path": ""
      }
    },
    {
      "email_id": "faf96a73-5be4-481a-9c6c-7ab8fb2e3cf0",
      "size_bytes": 8534,
      "account_name": "mws",
      "recipients": [
        "frank@yahooo.com"
      ],
      "subject": "FWD: Want Pills V|AgR@ % Xan_a_x ^ Valiu|m|  lNmAL",
      "script_header": {
        "raw": "",
        "domain": "",
        "path": ""
      }
    },
    {
      "email_id": "fbc2efd0-1808-4e54-99ce-3082708b28ee",
      "size_bytes": 8971,
      "account_name": "oregdent",
      "recipients": [
        "steve@hillcabinet.com"
      ],
      "subject": "FWD:Xanax.x Valium.m Xanax.x Vicodin.n h ogzmwggi",
      "script_header": {
        "raw": "",
        "domain": "",
        "path": ""
      }
    }
  ],
  "max_count": 3
}

# Show Email message

Root user, if needed, can see any message held in a quarantine. In order to do this email ID is needed. It can be taken from the list command above.

Command

ie-cli emails show --id <EMAIL_ID> [-a <ACCOUNT_NAME>] [--json]

Example

ie-cli emails show --id f3367f1b-4216-4f4f-9617-f8be9f5a6e76 -a root

Output

EmailID:                      f3367f1b-4216-4f4f-9617-f8be9f5a6e76
SizeBytes:                    8534
AccountName:                  mws
Sender:                       mws@mywebsite.com
Recipients:                   me@somehost.com
ReceivedDate:                 1643805800
Subject:                      FWD: Want Pills V|AgR@ % Xan_a_x ^ Valiu|m| # At|v@`n \ Pn+ermin ' So+m+a  lNmAL

Content-Transfer-Encoding:    quoted-printable
Content-Type:                 text/html; charset="iso-8859-7"
Date:                         Fri, 13 Feb 2019 04:48:28 +0300
From:                         "wilhelmina rivard" <rivard1792@hinet.net>
MIME-Version:                 1.0
Received:                     from [70.100.200.300] (port=56330 helo=Myaccout) by 70.100.200.300.cprapid.com with esmtpsa  (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from <mws@mydomain.com>) id 1nFEym-0005TO-Qs for me@somehost.com; Wed, 02 Feb 2022 12:43:20 +0000
To:                           <abazis@iit.demokritos.gr>

X-ImunifyEmail-Filter-Action: reject
X-ImunifyEmail-Filter-Score:  6.1
X-Mimeole:                    Produced By Microsoft MimeOLE V6.00.2900.2527
X-Msmail-Priority:            Normal
X-Priority:                   3
X-Failed-Recipients:          []

Body: 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

# Release or Remove a message from the quarantine

Messages can be released from the quarantine and sent to recipients if they are false positives. They can also be deleted if needed to free up space.

# Release

Command

ie-cli emails release --ids EMAIL_ID_1,EMAIL_ID_2 -a root

Example

ie-cli emails release --ids fb7c3537-8e5e-43d8-bc66-bd954c22d587 -a root

Output

OK

# Remove

Command

ie-cli emails remove --ids fb7c3537-8e5e-43d8-bc66-bd954c22d587 -a root 

Output

OK

# Accounts settings

ImunifyEmail stores emails marked as spam in a quarantine space. The space is divided into virtual subspaces for every system account. Subspace is created when the first spam message is quarantined. It is filled with spam messages for a particular account until the size limitation is reached. When the size limitation is reached most old messages will be automatically deleted.

There are command line commands for managing quarantine space.

# List all accounts in the quarantine

Command

ie-cli accounts list [--json]

Output

Name      	     LimitBytes	     UsedBytes	     State	
mysite           125829120  	 810692     	 active 	
dentistcenter    104857600  	 0          	 active 	

Max Count 2	 

Output (JSON)

{
   "items":[
      {
         "name":"mysite",
         "limit_bytes":125829120,
         "used_bytes":810692,
         "state":"active"
      },
      {
         "name":"dentistcenter",
         "limit_bytes":104857600,
         "used_bytes":0,
         "state":"active"
      }
   ],
   "max_count":2
}

# Edit account size limit

Sometimes it is necessary to give more (or less) space in the quarantine for some user accounts. It is possible to do using the following command.

Command

ie-cli accounts edit -a ACCOUNT_NAME [--state=active|block] [--limit=1024]

Example

ie-cli accounts edit -a mydomain --state=active --limit=8096

Output (JSON)

Name       LimitBytes	 UsedBytes	 State	
mws        8096          810692      active 	

Output

{
   "name":"mws",
   "limit_bytes":8096,
   "used_bytes":160461,
   "state":"active"
}

# Clean all quarantine for an account

If needed all quarantine for an account can be cleaned with one command.

Command

ie-cli accounts remove -a <ACCOUNT_NAME>

Example

ie-cli accounts remove -a root

Output

OK

# Whitelisting

Imunify Email supports whitelisting configuration. It is possible to whitelist domains and/or email addresses of a sender.

# Available commands

In general, all whitelisting operations could be described by the next pattern:

ie-cli whitelist WHO OPERATION [value1 value2 ... valueN]

Where WHO is one of:

• authuser (only email address)
• sender (email address or domain name)

OPERATION is one of:

• add
• list
• remove

value1 valu2 ... valueN - email addresses and domains (actual for the add and remove commands)

Command

ie-cli whitelist --help
List/Add/Delete authenticated users, senders and recipients to/from whitelist.
Where :
    - authenticated user could be only an email address
    - sender and recipient could be one of domain or email address

Usage:
  ie-cli whitelist [command]

Available Commands:
  authuser    operation with the whitelist of the authenticated users (email addresses)
  sender      operation with the whitelist of senders (email addresses and domains)

Flags:
  -h, --help   help for whitelist

Use "ie-cli whitelist [command] --help" for more information about a command.

# See all whitelist senders

Command

ie-cli whitelist authuser list  [--json]

Output

EMAILS
1@example5.com
pp@ppp.com
qq@qq.com
me@mydomain.com

DOMAINS
No available data

Output (JSON)

{
 	"success": true,
 	"emails": [
 		"1@example5.com",
 		"pp@ppp.com",
 		"qq@qq.com",
 		"me@mydomain.com"
 	],
 	"domains": []
 }

# Whitelist a sender

To whitelist a domain or/and an email address use the following command.

Command

ie-cli whitelist sender add domain.com some_email@domain.com

Output

Adding sender(s) to the whitelist:
1. domain    domain.com
2. email     some_email@domain.com
OK

# Remove sender from the whitelist

If needed, the sender can be removed from the whitelist. See the following commands.

Command

ie-cli whitelist sender remove domain.com

Output

Removing sender(s) from the whitelist:
1. domain    domain.com
OK

# Activity Monitor

To get understanding of Activity Monitor see the next section. ie-cli provides and API to get the same information as UI does from the Activity Monitor. ie-cli allows to

1. get the Activity Monitor statistics
2. set/remove/update sender limits for the particular account/domain/email/script
3. get/update server limits that applied by default

Command

ie-cli am --help

This subcommand interacts with the Activity Monitor to return statistics, get/set settings for
the sender objects.
Activity Monitor operates by the sender objects. Sender object is an object on behalf of which
client sends email. It could be one of: "account", "domain", "script" or "sender_email"

Usage:
  ie-cli am [command]

Available Commands:
  limit           The limit value of sender object can be applied on particular domain, sender email and account
  server-settings Operates by the server sender limit settings and allows to set default limit that is applied for all sender objects
  stats           stats (statistics) returns the aggregated view of senders objects with various filters

Flags:
  -h, --help   help for am

Use "ie-cli am [command] --help" for more information about a command.