At least one sender (boldin.com) cannot send email to my hotmail account

Hi,

Thank you for sharing your question. I completely understand how stressful it is when a sign‑in email never arrives and you can’t access your account.

Based on my knowledge the most common causes are the sender’s domain or IP reputation, missing or incorrect authentication (SPF, DKIM, DMARC), or a service‑level block on Microsoft’s side that only the sender can remediate; Outlook.com’s anti‑spam systems evaluate the sending IP and domain reputation, authentication status, and complaint rates, and can temporarily or persistently block traffic even if your personal mailbox looks fine.

To move toward a resolution, there are two parallel tracks: on your side, quickly rule out client‑level filtering by checking Junk Email, the “Other” tab if Focused Inbox is on, your Blocked Senders and Safe Senders lists, inbox rules, and mailbox storage, because those are the areas a consumer Hotmail user can control; this is exactly what Microsoft’s support discussions recommend when verification emails don’t show up.  On the sender’s side, Boldin (or their email service provider) needs to examine their bounce logs and, if they see 5.7.x “Access denied” style errors, use Microsoft’s delist portal at sender.office.com and align their DNS and sending practices per Outlook.com Postmaster guidance; Microsoft’s documentation is explicit that external senders must delist their sending IPs and ensure proper authentication and reputation to deliver to Outlook.com and Hotmail.

May I ask whether Boldin’s support can share the exact bounce or NDR text they receive when sending to your address, including any 5.7.x error codes or S‑codes, and can they confirm they have checked and, if needed, submitted their sending IP through the Microsoft delist portal? If you can provide that error snippet.

Let me know how it goes.

Best Regards,

Noel