Don’t worry, this will only take a few seconds.
If you are using an email client other than Gmail, then please visit whitelist.guide and choose your email provider.
If you are using Gmail, the best way to whitelist an email sender is to create a filter which categorises the sender’s emails as belonging in the Primary Inbox.
This is easy to do and only takes about 20 seconds. (N.B. This can only be done in a browser, not in a smartphone app).
Step One: Click the three dots in the right-hand corner of the email and choose Filter messages like this.
Step Two: Make sure the “From” line says “email@example.com” and click Create filter.
Step Three: Check Never send to Spam, Categorize as “Primary”, check Also apply filters to matching conversation(s) and then click Create filter.
And that’s that! Now you can enjoy receiving the emails and all the goodies you have signed up for.