Travelers cannot identify how their private email addresses are being compromised during international trips

Frequent international travelers with privacy-conscious email practices are receiving unsolicited emails at obscure, never-published email addresses immediately after traveling abroad, indicating their communications are being intercepted or their devices are being compromised at border crossings or through cellular networks. Current solutions fail because travelers lack visibility into what data is being accessed on their devices, how their email addresses are being harvested, and which specific point in their travel (airport, hotel, cellular network) is the vulnerability.