Sender Policy Framework
SPF is a tool for domain owners. If you are not the domain owner, but there is an SPF record in your e-mail address, you cannot avoid SPF. However, if you are the domain owner and you manage your own domains, then you can choose to implement it or not. However, if you decide against SPF, your domain is vulnerable to hackers or spammers, who can then use your domain as a "cover" for illegal purposes.
If you do not manage your domains directly, the decision whether to implement SPF or not can be restricted by the administrator of your domain. However, you can still participate in this decision by having your administrator change, delete or switch your SPF record. However, if the administrator deletes your SPF record, he or she will make your domain more vulnerable to abuse.