The SPF record for mycompany.com is shown in the exhibit as:
v=spf1 a mx ip4:199.209.31.21 -all
This means that the domain mycompany.com authorizes the following sources to send email on its behalf:
The A record of mycompany.com, which resolves to 199.209.31.21
The MX record of mycompany.com, which points to mail.mycompany.com, which also resolves to
199.209.31.21
The IP address 199.209.31.21
The -all qualifier means that any other source is not authorized and should be rejected.