Understanding Blocked, Forbidden, and Disposable Domains

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Blocked Domains

One way Lead Gen & CRM maintains security is by proactively checking the sending domain an email is about to use. Consider the sending address From:sender@example.com. Lead Gen & CRM would check the example.com domain.

While extremely uncommon, you may receive in-application messaging if the sending domain can not be used. These domains are considered as blocked.

Some examples of addresses that may be flagged and blocked include:

• Domains that may be used for phishing or fraud
• constantcontact.com domains (or other domains that Lead Gen & CRM uses as a company)
• Disposable email addresses
• Domains with DMARC rejection policies

However, any domains that have been verified and authenticated may be used without concern.

Be aware that certain form settings, when enabled, will prevent you from using free email providers in the form's email address field. The list of blocked free email providers can be found here.
 

Forbidden Domains

Free email providers—such as Gmail, Yahoo!, and Outlook—are forbidden domains on Lead Gen & CRM. As you do not own the domain, if you were to send from Lead Gen & CRM from a Gmail, Yahoo!, or Outlook address, it would appear that you have the authority to send on behalf of Gmail, Yahoo!, or Outlook. You do not. Since you cannot authenticate that you have permission or authority, it can cause deliverability and compliance issues. To prevent these issues, Lead Gen & CRM forbids sending from these domains.

You can engage in limited bulk sending through Mail Sync. When enabled, your Smart Mails will be sent through Simple Mail Transfer Protocol (SMTP). However, you cannot engage in regular bulk mail sending to your full lists. This is due to the fact that you cannot set up DomainKeys Identified Mail (DKIM) on these accounts.

Refer to the Email Authentication: DKIM Overview help article for more information on DKIM. 

Disposable Domains

Disposable domains are temporary email addresses most often used to avoid receiving mail in an actively monitored inbox. Temporary, in this case, means that the addresses are set to expire or otherwise self-destruct after a set amount of time—sometimes as soon as only a few minutes after the disposable domain has been created. Initially, emails will be delivered, but they will not be monitored. Sending to disposable domains is considered poor practice. This is because, over time, the email address will expire and cause bounces. Emails bouncing will negatively impact your sending reputation.

Refer to the following external information for a list of disposable domains and how list verification and cleaning services can identify them:

• GitHub: A List of Domains for Disposable and Temporary Email Addresses
• Webula: What's hiding in your email

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