I'm pretty sure that was changed by South Dakota v. Wayfair[0]. Most states seem to only require you collect the tax if you have 200 shipments into the state or $100k in revenue because going after a small time out of state e-commerce business over a few dollars of tax probably wouldn't be worth it but a large firm in Delaware refusing to collect tax on shipments into California would probably be hearing from California's government.
If you're shipping overseas, you can probably ignore foreign taxes if you don't have a business nexus there. Especially if you have no desire to ever visit those countries. Basically just leave it up to your customers to pay whatever tax they owe.
[0]: https://en.wikipedia.org/wiki/South_Dakota_v._Wayfair,_Inc.