Mails sent from outlook.com to Gmail accounts end up in the spam folder instead of inbox

Occasional Contributor

All my mails sent from outlook.com account to ANY Gmail account end up in the spam folder of the recipient. Only after whitelisting my mail as a safe sender on Gmail does my new mail go directly to the inbox. I've been facing this problem for a while now, but all those times the recipient was expecting a mail from me and if they didn't receive one, they would check with me. But if I'm sending a mail to a new contact and they aren't expecting a mail from me or haven't whitelisted me my mail goes unnoticed completely. Does anyone know how to fix this issue?

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