If You Are Sending Messages to Guessed Emails, You Will Likely Want to Push Them to Salesforce
Any time you request a contact from Apollo, there is a chance that our manual fulfillment team will return a guessed email (more information on email statuses here). These are filterable on the Contacts page and are demarcated by the orange mail icon:
By default, contacts that have guessed emails, such as those in the list above, will not push to Salesforce because it is not data that we could fully verify.
If you are messaging, sequencing, or calling these contacts in Apollo, however, then you can override this default from within Settings > Integrations > Salesforce > Contacts > 'Push guessed emails from Apollo to Salesforce':