Proton
Empowering you to choose a better internet where privacy is the default. Protect yourself online with Proton Mail, Proton VPN, Proton Calendar, Proton Drive. Proton Pass and SimpleLogin.
Proton Mail is the world's largest secure email provider. Swiss, end-to-end encrypted, private, and free.
Proton VPN is the world’s only open-source, publicly audited, unlimited and free VPN. Swiss-based, no-ads, and no-logs.
Proton Calendar is the world's first end-to-end encrypted calendar that allows you to keep your life private.
Proton Drive is a free end-to-end encrypted cloud storage that allows you to securely backup and share your files. It's open source, publicly audited, and Swiss-based.
Proton Pass Proton Pass is a free and open-source password manager which brings a higher level of security with rigorous end-to-end encryption of all data (including usernames, URLs, notes, and more) and email alias support.
SimpleLogin lets you send and receive emails anonymously via easily-generated unique email aliases.
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Does Proton actually bounce if the sender is not properly configured???
It depends. They, like all mail services, will follow DKIM and SPF so if someone has DKIM+SPF set on company.com correctly and someone sets up a newsletter sending from mail.company.com, that's a misconfiguration that causes Proton, Gmail, Yahoo, AOL, Microsoft, Apple, and all the other large players to bounce the email.
yeah i think this might be the reason, but i don't know how to avoid this since it's an issue from their side
Nothing you can do until they fix it. If they really want to recruit you that bad, ask them to send the email to themselves and forward it to you.