I've seen cases where spammers abuse sign-up forms to generate spam (by using the name field for their content). Without server side validation it would be triv

I've seen cases where spammers abuse sign-up forms to generate spam (by using the name field for their content). Without server side validation it would be trivial for a malicious user to accomplish this. Shameless plug - I run a hosted alternative to Sendy https://www.mailblast.io/ https://www.mailblast.io/