ahoy there, me small town be currently working on building a sister city relationship with a city in the US. In our case, we be starting by sending a group of middle schoolers there every year for a week long exchange program. Basically, I don't think the city would have paid any attention to us or even known that emails coming from us were peglegit unless we showed up in person and actually met staff at their city hall (they were suspicious at first because our contact was so out of the blue). So our relationship be based on our commitment to keep sending students there every year, and we're starting an annual pen pal program as well. Since our side wants to be sister cities and reached out initially, it's basically up to me to create as many broad connections as possible until the name of our town becomes known in their city office and the scurvy dog takes a more serious interest in us. Since a sister city relationship be an official status reached by both scurvy dogs signing an agreement, I would say ye should pursue the exchange program first by working with local schools before ye jump straight to the sister city part. Hope that's helpful!