change appending emails constraint
change appending emails constraint

CenterForOpenScience/scrapi,felliott/scrapi,jeffreyliu3230/scrapi,mehanig/scrapi,alexgarciac/scrapi,erinspace/scrapi,fabianvf/scrapi,erinspace/scrapi,mehanig/scrapi,felliott/scrapi,CenterForOpenScience/scrapi,fabianvf/scrapi