PRTG Manual: System Administration—Notification Delivery

SMTP Delivery Mechanism

Define how mails are sent using Simple Mail Transfer Protocol (SMTP). Choose between:

• Direct delivery using built-in mail relay server (default): Use the SMTP relay server built into PRTG. This server manages its own email queue. For each email, it will look up the target SMTP server via the MX record of the target domain, and send the email.
• Use SMTP relay server (recommended inside LANs/NATs): Set up you own SMTP relay server to send emails. Enter data below.
• Use two SMTP relay servers (primary and fallback server): Set up two own SMTP relay servers—one primary and one as fallback server. Enter data below.

Note: When monitoring inside your NAT or LAN it is often a good idea to use your own LAN-based relay server to deliver notification emails quicker.

Sender Email

Enter an email address that will be used as sender of all emails. This setting is global and can only be changed centrally here.

Sender Name

Enter a name that will be used as sender of all emails. This setting is global and can only be changed centrally here.

HELO Ident

Enter the HELO Ident for SMTP. This must be a unique name, preferably the DNS name of the machine running PRTG. See SMTP RFC 2821: The sender-SMTP must ensure that the domain parameter in a HELO command is a valid principal host domain name for the client host.

SMTP Relay Server

This field is only visible if SMTP relay server is enabled above. Enter the IP address or DNS name of the SMTP relay server.

SMTP Relay SMTP Port

This field is only visible if SMTP relay server is enabled above. Enter the port number the SMTP relay server is running on. Standard value is 25.

SMTP Relay Authentication

This field is only visible if SMTP relay server is enabled above. Select the kind of authentication required for the SMTP server. Choose between:

• No authentication is required: Use SMTP without authentication.
• Use standard SMTP authentication: Use standard authentication.
• SASL authentication is required: Use secure authentication via Simple Authentication and Security Layer (SASL).

SSL Method

This setting is only visible if SMTP relay server is enabled above. It is only relevant for secure connections. Select the SSL method to use. We recommend using the default value. If you do not get a connection, try with another setting.

SMTP Relay Username

This field is only visible if SMTP authentication is enabled above. Enter a valid user name.

SMTP Relay Password

This field is only visible if SMTP authentication is enabled above. Enter a valid password.

Security

This field is only visible if SMTP relay server is enabled above. Enter the security level for SMTP connections. Choose between:

• No encryption (use plain text): Use insecure connection with plain text transfer.
• Encrypt data using Transport-Level Security (TLS): Use a secure connection.

SMTP Relay Server (Fallback)

These fields are only visible if the option for two SMTP relay servers is enabled above. Please see respective settings for primary SMTP relay server above.

SMTP Relay SMTP Port (Fallback)

SMTP Relay Authentication (Fallback)

SSL Method (Fallback)

SMTP Relay Username (Fallback)

SSL Method (Fallback)

SMTP Relay Username (Fallback)

SMTP Relay Password (Fallback)

Security (Fallback)

Note: Although PRTG has built-in support for the Application Programming Interface (API) of some SMS providers, we cannot officially provide support regarding these SMS service providers. If you have technical questions about SMS delivery beyond PRTG, please contact your SMS provider directly. Note: Instead of using a pre-configured provider you can always use a custom URL, enabling you to use extended parameters (this is also an alternative when using providers for which we offer pre-configured options).

You need an internet connection to send text messages via the HTTP API. For information about sending SMS via separate hardware using third party software, please see the More section below.

Configuration Mode

Define how you want to select an SMS provider. Choose between:

• Select a SMS provider from a list of providers: Select a provider from a list below.
• Enter a custom URL for a provider not listed: Use another provider and enter the service URL manually below.

Service Provider

This field is only visible if the provider list is enabled above. Choose a service provider from the list. PRTG offers a small incomplete list of providers. Note: Some providers might require a port configuration in your firewall. See More section below for more information.

Username

This field is only visible if the provider list is enabled above. Enter a user name for the service provider account.

Password

This field is only visible if the provider list is enabled above. Enter a password for the service provider account.

API ID / Account

This field is only visible if the provider list is enabled above. Some providers need an additional API ID or account information. If provided, enter it here. Please enter a string or leave the field empty.

Custom URL

This field is only visible if the custom provider option is enabled above. From the documentation of your SMS provider, please enter the service URL that is used to send SMS messages. Use the following placeholders for the recipient phone number and the text message: %SMSNUMBER, %SMSTEXT.

Maximum Length of Text

Some SMS providers will not allow SMS messages exceeding a certain amount of characters. PRTG will restrict the number of characters according to the length specified in this field. A value of 0 means the SMS is sent at its full length.