Blocked Email Responses

“PPE Hosted Dispatch” identifies the mail gateway that generated the nondelivery report, so the family member should open the report and find the complete SMTP error code—such as 550 5.7.xxx—to determine the required fix.^1^

Microsoft Q&A participants cannot access or review an individual Hotmail/Outlook.com account.

Why this probably is not your personal blocked-senders list

In Outlook.com, personally blocking a sender ordinarily moves that sender’s messages to Junk Email; it does not normally reject the message back through an external mail gateway.^2^

A PPE Hosted Dispatch notice instead usually means the sending service or recipient server rejected the message. The actionable reason appears later in the report, not in the “PPE Hosted Dispatch” heading.

Ask one affected family member to send you—by text message or another email account—the following parts of the bounce:

• The complete SMTP status, beginning with 550, 552, or another number.
• The text after Remote server returned, Diagnostic information, or host … said.
• Any mention of SPF, DKIM, DMARC, spam, policy, reputation, mailbox full, or an invalid address.
• Remove names and email addresses before posting it publicly.

Checks you can perform in Outlook.com

Although a server-level rejection cannot normally be overridden by a personal safe-senders entry, check the mailbox configuration once:

1. Open Outlook.com → Settings → Mail → Junk email.
2. Under Blocked senders and domains, remove any affected address or domain if present.
3. Under Safe senders and domains, select Add safe sender, enter each family member’s address, select OK, and then Save.^3^
4. Go to Settings → Mail → Rules and remove any rule that deletes or redirects their messages.
5. Check Outlook.com storage. If Microsoft cloud storage is full, new messages are rejected and messages sent while it was full cannot be recovered; the senders must resend them after space is available.^4^

Match the bounce to the next action

• 550 5.7.515, authentication required, or SPF/DKIM/DMARC failure: The family member’s email provider or mail administrator must correct its domain authentication. The rejection occurs before the message reaches your mailbox, so adding a safe sender cannot override it.^5^
• Banned or blocked sending IP / poor reputation: The sender or their provider must follow the instructions in the nondelivery report. Outlook.com can reject mail because of sending-IP reputation, reverse-DNS, authentication, or other anti-spam signals.^6^
• Spam or content rejection: Have the sender try one plain-text message with no attachment, signature, shortened link, image, or repeated forwarded content. If that succeeds, restore the removed content incrementally to identify the trigger.^7^
• Mailbox full: Free Outlook.com/Microsoft storage, and then ask the family member to resend.
• Invalid recipient: Have the sender create a new message and type your complete address manually instead of replying or selecting an old autocomplete entry.
• 550 5.7.703: This refers to an organization’s Tenant Allow/Block List and applies to managed Exchange organizations; only that organization’s email administrator can change it.^8^

If several family members using different email providers began receiving the same SMTP error today, contact Outlook.com support while signed in: select Help (?) in Outlook.com, enter the problem, and under Still need help? select Yes. Include one complete nondelivery report with personal addresses removed.^4^

References

1. Why am I receiving a PPE Hosted Dispatch mail error
2. Fixes or workarounds for recent issues on Outlook.com | Microsoft Support
3. Safe Senders in Outlook.com | Microsoft Support
4. Can't send or receive email in Outlook.com | Microsoft Support
5. One of my contact's e-mails are blocked on Outlook.com. Previously they were marked as "Unverified" - Microsoft Q&A
6. Sender Support in Outlook.com | Microsoft Support
7. emails undeliverable - Microsoft Q&A
8. Fix NDR error codes 550 5.7.703, 550 5.7.705, 550 5.7.708, and 550 5.7.750