PRTG Manual: Notification Delivery

SMTP Delivery Mechanism

Define how PRTG sends emails using the Simple Mail Transfer Protocol (SMTP):

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

If you monitor the IT infrastructure in your network address translation (NAT) or LAN, using your own LAN-based relay server ensures faster delivery of notification emails.

This option is not available in PRTG hosted by Paessler. PRTG hosted by Paessler uses SendGrid for email notifications. For more information, see the Paessler website: FAQ – PRTG hosted by Paessler.

Sender Email

Enter an email address to use as sender of all emails. This setting is global and applies to all email notifications by default. You can override the sender email in the settings of individual notifications.

Sender Name

Enter a name to use as sender of all emails. This setting is global and applies to all email notifications by default. You can override the sender name in the settings of individual notifications.

If the name contains angle brackets (<>), PRTG replaces them with braces ({}) for security reasons. For more information, see the Knowledge Base: What security features does PRTG include?

HELO Ident

Enter the HELO Ident for SMTP. This must be a unique name, preferably the Domain Name System (DNS) name of the PRTG core server system. 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.

This option is not available in PRTG hosted by Paessler.

SMTP Relay Server

This setting is only visible if you enable SMTP relay server above. Enter the IP address or DNS name of the SMTP relay server.

This option is not available in PRTG hosted by Paessler.

SMTP Relay SMTP Port

This setting is only visible if you enable SMTP relay server above. Enter the port number that the SMTP relay server runs on. The standard port is 25.

This option is not available in PRTG hosted by Paessler.

SMTP Relay Authentication

This setting is only visible if you enable SMTP relay server above. Select the kind of authentication required for the SMTP server:

• 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).

This option is not available in PRTG hosted by Paessler.

SMTP Relay User

This setting is only visible if you enable Use standard SMTP authentication above. Enter a valid username.

This option is not available in PRTG hosted by Paessler.

SMTP Relay Password

This setting is only visible if you enable Use standard SMTP authentication above. Enter a valid password.

This option is not available in PRTG hosted by Paessler.

Connection Security

This setting is only visible if you enable SMTP relay server above. Define the connection security for SMTP connections:

• Use SSL/TLS if supported (default): Use a Secure Sockets Layer (SSL)/Transport Layer Security (TLS) secured connection.
• Do not use connection security: Use an unsecure connection with plain text transfer.

This option is not available in PRTG hosted by Paessler.

SSL/TLS Method

This setting is only visible if you enable SMTP relay server and connection security above. It is only relevant for secure connections. Select the SSL or TLS version that your SMTP device supports. We recommend that you use this option. If you do not get a connection, try with a different setting. Choose from:

• SSLv2 or SSLv3 (default)
• SSLv3
• TLS 1.0
• TLS 1.1
• TLS 1.2

This option is not available in PRTG hosted by Paessler.

SMTP Relay Server (Fallback)

These fields are only visible if you enable the option for two SMTP relay servers above. See also the settings that you made for your primary SMTP relay server.

This option is not available in PRTG hosted by Paessler.

SMTP Relay SMTP Port (Fallback)

SMTP Relay Authentication (Fallback)

Connection Security (Fallback)

SSL/TLS Method (Fallback)

SMTP Relay User (Fallback)

SSL Method (Fallback)

SMTP Relay User (Fallback)

SMTP Relay Password (Fallback)

Test SMTP Settings

Click Test SMTP Settings to test your SMTP notification delivery configuration.

• Email Address: Enter an email address to send the test email notification to.
• Subject: Enter a subject for the test email notification.

This option is not available in PRTG hosted by Paessler.

Configuration Mode

Define how you want to select an SMS provider:

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

Service Provider

This setting is only visible if you enable Select an SMS provider from a list of providers above. Select a service provider from the list.

Some providers might require a port configuration in your firewall. For more information, see the Knowledge Base: Which URLs does PRTG use for its preconfigured SMS providers?

User

This setting is only visible if you enable Select an SMS provider from a list of providers above. Enter a username for the service provider account.

Password

This setting is only visible if you enable Select an SMS provider from a list of providers above. Enter a password for the service provider account.

API ID / Account

This setting is only visible if you enable Select an SMS provider from a list of providers above. Some providers need an additional API ID or account information. If provided, enter it here. Enter a string or leave the field empty.

Custom URL

This setting is only visible if you enable Enter a custom URL for a provider not listed above. From the documentation of your SMS provider, 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

Use the GET method to request the custom URL. POST requests are not supported.

HTTP Authentication

This setting is only visible if you enable Enter a custom URL for a provider not listed above. Select if PRTG uses HTTP basic authentication when it calls the custom URL of your SMS provider:

• Do not use HTTP basic authentication (default)
• Use HTTP basic authentication

HTTP basic authentication is necessary if the custom URL reads like https://[username]:[password]@my.custom.sms.provider/.

Custom SNI

This setting is only visible if you enable Enter a custom URL for a provider not listed above.

Select if PRTG sends the Server Name Identification (SNI) extension to the Transport Layer Security (TLS) protocol along with the HTTP request:

• Do not send SNI (default): PRTG does not send the SNI when executing the HTTP action.
• Send SNI: PRTG sends the SNI when calling the target URL. Specify the SNI below.

Virtual Host (SNI)

This setting is only visible if you enable Send SNI above. Enter the SNI name that your endpoint configuration requires. Usually, this is the fully qualified domain name (FQDN) of the virtual host.

Encoding for SMS

This setting is only visible if you enable Enter a custom URL for a provider not listed above. Define the encoding of the URL string that PRTG sends to your provider:

• ANSI local system code page (default)
• UTF-8
• UTF-16

Maximum Length of Text

Some SMS providers do not allow SMS messages that exceed a certain amount of characters. PRTG restricts 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.

Test SMS Settings

Click Test SMS Settings to test your SMS notification delivery configuration.

• Number: Enter a phone number to send the test SMS notification to.
• Message: Enter a message for the test SMS notification.