We recommend using SPF to protect your email from misuse, even if you're not using Email2SMS.
Want to check whether you already have an SPF record?
We can check this for you or you can use a tool like this
A note to your Tech Team
Cut and paste the following into an email to your tech team requesting the set up of an SPF record, make sure you put your domain name in where >enter your domain name here< is currently;