If you want to use a different SMTP service for sending your camera alerts, you can find several by searching for "free SMTP server" via Google or your search engine of choice. I just picked one of the ones that seemed to be recommended and had a free plan that was consistent with the number of alerts I expect to send/see each day. I signed up for the service and substituted the SMTP server name and authentication credentials for the one I was previously using with Gmail. Took less than 20 minutes to search, signup, change out the SMTP server, and test it out (and I'm pretty slow). I ended up picking sendinblue for my SMTP server, but there are many other available options that might work better for you depending on where you are located.