IS 550 in an RBL?
When you receive an Error 550 Message Rejected (or blocked) when trying to send an email, this means that a spam filter has blocked the message. This error is occurring because your email domain is appearing in a Real-time Blackhole List (RBL).
What is a 550 blocked?
550 Blocked error or 550 Requested action not taken: mailbox unavailable is an SMTP (Simple Mail Transfer Protocol) error code. Put simply, this message means that the email you sent was blocked by the recipient’s email hosting server, and returned to you.
What is RBL restriction?
An RBL (remote block list or realtime blackhole list), also called a DNS-based blacklist or block list, is a spam-fighting tool. There are two ways RBLs can affect your email: by preventing spam from reaching your mailbox and by preventing email you send from reaching other mailboxes.
What is a 550 server error?
A “550 Authentication is required for relay” error indicates that your email server requires SMTP authentication in order to send outgoing mail, but the email client used to send email has not been authenticated with your username and password. Fortunately, resolving this error can be done quickly and easily.
Is my IP address being blocked?
How Do I Know If My IP Is Being Blocked? To confirm you are blocked from accessing your server, you should try to log in to your web server, as usual, to see what kind of connection error message you’re getting. This error will often provide a specific reason that your IP has been blocked.
What is DNS RBL?
A Domain Name System-based blackhole list, Domain Name System blacklist (DNSBL) or real-time blackhole list (RBL) is a service for operation of mail servers to perform a check via a Domain Name System (DNS) query whether a sending host’s IP address is blacklisted for email spam.
What does a 550 error code mean?
What does server Error 550 relay not permitted mean?
When a user receives a 550 relay not permitted error, it means they are not permitted to send an email via the server that they are attempting to send an email from. When users send an email from their Internet Service Providers (ISP) mail servers, they generally do not have to authenticate themselves.
What causes the error ” 550 email blocked ” email error?
What causes the error “550 Email blocked”? Mail servers use 3rd party services such as SpamCop, MSRBL, JunkEmailFilter, etc. to identify spam. These third party services analyze incoming mail and classify them as spam or not-spam based on the sender’s server IP, message header, attachments, and more.
What to do when you get 550, 553 or relay prohibited error message?
When you get a 550, 553 or relay prohibited error message, then you need to enable authentication for your SMTP server configuration in Outlook. The first step is to check which IP address is being reported. In most cases, this is either your IP address or the IP address of the mail server that is trying to deliver your message.
What does it mean when your IP address is in RBL?
Your IP xx.xxx.xxx.xx is in RBL What does this error mean and how do I fix this? This means that the receiving mail server did not accept your message because the IP address of the sender is on a blacklist (usually due to spamming abuse). This can be either your IP address or the IP address of the mail environment that hosts your mailbox.
How to check if your domain is RBL blocked?
An excellent RBL checking tool is available at www.mxtoolbox.com. Find out if your domain has been listed by Spamhaus using the “Domain Lookup Tool” in the URL listed below. If the domain is listed, request delisting the domain.