UTM parameters help Zaius track what campaigns and content (specific message) your email recipients are clicking on and visiting your website through, as well as the medium (channel) and source.
The default option in campaign touchpoint creation is to allow Zaius to set those UTM parameters. This option is found in the details tab.
SendGrid also has a setting to automatically add UTM parameters. Within the SendGrid UI, this is found in Settings > Tracking > Google Analytics. Typically, this setting should be turned off so that two sets of parameters are not added.
However, if emails are being sent both through Zaius and through SendGrid without Zaius, there may be reasons to keep this setting in SendGrid enabled, to ensure that non-Zaius emails have UTM parameters applied.
In the above scenario, you would want SendGrid to sometimes attach UTM parameters (e.g. when sending directly through SendGrid), but specifically not attach UTM parameters when Zaius already took care of it. To allow this, an option is available to override UTM parameters when the touchpoint comes from Zaius:
The above option, located at the bottom of the touchpoint page, is set to be on by default. When Zaius is sending an email through SendGrid, the links will only have one set of UTM parameters, and those will be set by Zaius.
To override this behavior and always allow SendGrid to set UTM parameters, uncheck this box. This may result in your link including up to two each of utm_campaign, utm_content, utm_medium, and utm_source, which could complicate your analytics, depending on which tools you use. For example, Zaius always takes the first UTM parameters it sees, but Google Analytics takes the last UTM parameters it sees.