To check or test if you have published a CNAME record correctly on a domain, you can verify CNAME from the following website,
https://mxtoolbox.com/CNAMELookup.aspx.
The string to use is ecm-bounces.domain-name. For example, we will replace domain-name with
vtiger.com.
- Enter the following text in the CNAME Lookup field: ecm-bounces.vtiger.com
- Click CNAME Lookup
The screen will display the results in this format - The canonical name of
ecm-bounces.vtiger.com is ca.vtiger.email.
Note: In Vtiger, we recommend you use CNAME records to authenticate emails from Email Campaigns. CNAME is mandatory for email campaigns.