The email addresses of your users will determine which domain is used when sending emails. In other words, if you send a Pardot email and choose george@examplecompany.com as the sender, examplecompany.com is the domain that would be used.That is the domain that will need to be configured in Pardot and where the DNS entries will need to be placed.
Pardot customization will help companies to feel easy while working on it. If your users have different domains, each one that will be used will need to be configured.The Tracker Domain (aka CNAME) is essentially a mask that you place over your Pardot assets so they are branded with your company name instead of Pardot

Tracker Domains
Tracker domains are known as CNAME (Canonical name), or vanity URL, and, they enable you to mask your Pardot hosted content (pages, form or assets) with a branded URL. When you create assets in Pardot – such as forms, custom redirects, and landing pages – Pardot generates a link that begins with go.pardot.com. When you set up a tracker domain, it allows you to maintain your corporate branding. Branding gives assurance and security to your visitors that the links in your pages, forms or assets are legit and that they belong to your domain. In another word, a vanity URL is a unique web address that is branded for marketing purposes. Your tracker domain cannot be the same as your corporate domain name. You choose a simple alias that gives your visitors the good user experience. For example, if your corporate domain is www.example.com, then consider using one of the following: forms.example.com go.example.com www2.example.com info.example.com

Email Sending Domains
Implement DKIM and SPF Email Authentication
To achieve the best deliverability with Pardot, implement email authentication. Pardot uses the two most common standards: SPF and DKIM.
Use Email Authentication
With Pardot, you can send emails from your domain by authenticating through the two most widely accepted email authentication standards: Sender Policy Framework (SPF) and DomainKeys Identified Mail (DKIM). Major ISPs and corporate spam filters check for one or more of these types of authentication when determining whether to allow emails to a recipient’s inbox. Setting up email authentication is critical for achieving good deliverability.
Sender Policy Framework (SPF)
SPF is a form of email authentication that makes forging the sender of an email, or email spoofing, more difficult. SPF isn’t aimed at stopping spammers. Rather, it tightens loopholes used by spammers to spoof emails. SPF provides a list of all outbound email sources for a domain as a DNS TXT record. When a receiving mail server gets a message appearing to be sent from a certain domain, it checks the sender’s SPF statement to verify that information.
DomainKeys Identified Mail (DKIM)
DomainKeys is an email authentication system that verifies the DNS of an email sender and the message’s integrity.
Domain-Based Message Authentication, Reporting, and Conformance (DMARC)
A third layer of authentication that’s becoming more widely used is domain-based message authentication, reporting, and conformance, or DMARC. With DMARC, you notify receiving servers that your messages use SPF and DKIM and instruct them on what to do if they fail those authentication checks. Pardot can’t set up a DMARC policy for you, but we can help you ensure your emails are DMARC-compliant.

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