550 5.7.606: Banned sending IP (Microsoft)
Microsoft has blocked the IP address that sent your message, because of spam or poor reputation.
Blocked The address is probably fine. The problem is how the mail was sent.
What the bounce message looks like
The wording changes from one provider to another. These are typical examples:
550 5.7.606 Access denied, banned sending IP [203.0.113.9]. To request removal from this list please visit https://sender.office.com/Common causes
- Spam sent from the IP, possibly from a hacked account or website
- A shared IP with other bad senders
- Sending large volumes from a new IP
How to fix it if you sent the email
- If you use an email provider or marketing service, contact them; they manage the IP.
- If you run the server, request delisting through Microsoft's sender portal, linked in the bounce, after fixing the cause.
If you manage the receiving or sending mail system
- Find and stop the source of spam first, then request delisting.
Free tool: paste the full bounce into the bounce message decoder to get a plain-English reading of every code in it.
Questions people ask
- What does 550 5.7.606 mean?
- Microsoft has blocked the IP address that sent your message, because of spam or poor reputation.
- Is 550 5.7.606 a hard or soft bounce?
- Blocked. The address is probably fine. The problem is how the mail was sent.
- Should I remove the address after a 5.7.606 bounce?
- No. Fix how the mail is sent; the address itself is probably fine.