It does have SSL, you just have to install an appropriate site certificate. This is done by exporting the certificate from your browser then using WIM to import it to the C2550. The attached document will but is for older browser versions. Currently for Firefox Google Internet Authority is under GlobalSign not Equifax.
The main problem is that the C2550 is too old to support TLS/StartTLS. This might help. It allows port 25 but does require that you install a site certificate for SSL. Send email from a printer, scanner, or app - Google Workspace Admin Help
How do I setup SMTP over SSL on a Ricoh Family group device.pdf
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