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While ProtonMail is great, many companies block any incoming emails from protonmail.

One of them is my bank & insurance company. It's very frustrating. Both use the Trend Micro firewall.

Hi! We're sorry to hear that. Can you report to us at: https://proton.me/support/troubleshooting?product=account which exact bank and insurance company these are, so we can see what we can do? Thanks in advance.