Outlook.com.ar account flagged as spam globally + OneDrive emails rejected

Hello,

I'm experiencing critical email delivery issues with my Outlook.com.ar account (******@outlook.com.ar) that require urgent attention:

PROBLEM 1: Account marked as spam across all providers

• Emails sent from ******@outlook.com.ar are flagged as spam by Gmail, Outlook, Hotmail, and other providers
• The same content sent from my Gmail account (gmail.com) delivers normally to the same recipients
• This indicates my Outlook.com.ar account has a global spam reputation issue
• Volume: ~1 email per day, professional content (reports and analyses)
• Duration: several months
• Recipients can see emails in their spam folder (not rejected entirely)

PROBLEM 2: OneDrive automated emails rejected entirely

• Automated emails from OneDrive folder sharing are rejected completely
• Error code: 550 5.5.0 "mailbox unavailable"
• Server rejection: DM2PEPF00003FC9.mail.protection.outlook.com
• These bounce back and never reach recipients (not even spam folder)
• Email headers show antispam score of 14566002 (extremely high)

REQUEST: Please review and restore the sending reputation of ******@outlook.com.ar across global email systems.

Account details:

• Email: ******@outlook.com.ar
• Usage: Professional/legitimate (economic analyst, policy advisor)
• Content type: Reports, analyses, shared documents
• Sending method: Outlook desktop client

Attached: OneDrive bounce-back error details

Thank you for your prompt assistance.

Best regards, Juan Pablo Costa