Sending high-resolution event albums via email without hitting attachment limits

Hey guys, I could really use some practical advice regarding digital photo sharing with clients. Over the weekend, I shot a massive batch of high-resolution portraits at a private event, and the client has been asking me to email the full proofing gallery over. The problem is that when I try to bundle the pictures into a standard email message, my mail provider blocks it instantly because the total size is way over the attachment limit. I could set up a temporary cloud link, but some of my corporate clients have strict firewall policies that make downloading zip archives from external storage a nightmare. What’s the easiest way to reduce photo size so a whole bunch of pictures can fit smoothly into regular email attachments while keeping professional visual quality?