Proton
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SimpleLogin lets you send and receive emails anonymously via easily-generated unique email aliases.
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If the recruiter sent an email from a domain that wasn't properly configured (DKIM+SPF, etc) then it would have sent a bounce email, which may have gone to the recruiter's span folder, or they may have ignored the bounce email thinking it was a phishing email.
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.