RE: Remove additional text from the Subject Field
Hi Marvic,
It is the tracking token, which increase the probability for email identification and matching.
You can use the tracking token feature to improve email message tracking. A tracking token is an alphanumeric string generated by model-driven apps in Dynamics 365 and appended to the end of an email subject line. It matches email activities with email messages.
Tracking tokens add an additional correlation component to smart matching. When model-driven apps in Dynamics 365 generates an outgoing email activity, a resulting email response arriving in the Dynamics 365 apps system is then correlated to the originating activity.
By default, the tracking token feature is turned on.
Although we don't recommend it because it can significantly reduce the probability for accurate email activity to email message correlation, you can turn tacking tokens off. To enable, disable, or configure tracking tokens, do the following:
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Go to Settings > Administration > System Settings.
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Click the Email tab.
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In the Configure email correlation area you can disable, enable, or change the default tracking token structure.
Reference: https://docs.microsoft.com/en-us/power-platform/admin/email-message-filtering-correlation#how-model-driven-apps-in-dynamics-365-use-tracking-tokens