Graphs on Email

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If your email client has access to librenms then yes, from the docs;

Note: To use HTML emails you must set HTML email to Yes in the WebUI under Global Settings > Alerting Settings > Email transport > Use HTML emails

Note: To include Graphs you must enable unauthorized graphs in config.php. Allow_unauth_graphs_cidr is optional, but more secure.

$config['allow_unauth_graphs_cidr'] = array('127.0.0.1/32');  
$config['allow_unauth_graphs'] = true;

and then look at the example in here which contains img src https://docs.librenms.org/Alerting/Templates/

if your email client has no direct access to your librenms install, then your best shot is this recent thread Embed images not working on IOS devices

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