Salesforce Developer Cheatsheets

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https://developer.salesforce.com/page/Cheat_Sheets

Setup > Email Administration > Deliverability

Whenever you refresh a sandbox, all user email addresses are modified to use an 
example domain. The Salesforce message transfer agent ignores emails that end 
with @example.com, so no emails are sent from a sandbox. If you need to still 
test workflows in a sandbox and therefore need the email on, the Administrator 
should make it part of their routine on Sandbox refresh to also go in and 
dataload different (fake) addresses for every contact.
System.Url.getSalesforceBaseUrl().toExternalForm();
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