From a user perspective, the difference between accessing around 11 years of retention versus only a few months of retention is enormous - a difference of literally billions of articles. They currently provide access to 5365 days of retention across all binary and text newsgroups, which is massive compared to other independent providers that generally offer only a few months of retention. Thank you to all of the contributors who created this content and for MozillaZine for sharing this information.Founded in 1997, Newshosting is one of the oldest and most trusted Usenet providers known for providing the highest retention, most server locations, fastest speeds, and best service features. This article includes content contributed by the MozillaZine Knowledge Base. Exchange has a feature to reject messages if they're not from authenticated users.The recipient might have some sort of mailbox restriction enabled such as only accepting messages from a distribution list, and the sender isn't on that distribution list.The recipient is a virtual user and there is some problem (on their POP/IMAP server) mapping the virtual address into a real address.You're blackballed (your domain is listed as a spammer by some anti-spam listing service).The most common cause is not being authenticated by the SMTP server. The vendor can provide whatever error message they want to supplement the error code, but 5.7.1 always means there is a permanent failure of "Delivery not authorized, message refused". RFC 1893 defines an enhanced set of error codes for delivery status notification. If you have multiple SMTP servers double check that you're actually using the SMTP server that you think you are. If you're unsure what method is used goto your email providers web site and browse their email client support pages. This requires you to configure Postbox to use the appropriate VPN client. You need to use a Virtual Private Network (VPN) to connect to the SMTP server."POP before SMTP" relies upon the user checking for new mail (thus logging in to the POP server) and then sending a message within X minutes.Setup another account with a free email provider such as Gmail and use that account's SMTP server with your existing account when traveling. So this error might occur if you take your laptop somewhere else and use a public network. If you're using your ISP as an email provider it may check that you're logged into the internet using them.If you have that checkbox, you need to check it. Old versions of Thunderbird may also have a checkbox for "User name and password". If your email provider uses this method goto Tools -> Account Settings -> Outgoing Server (SMTP), select the appropriate SMTP server, press the Edit button, and enter the username. This is usually the same username/password used for the POP/IMAP server. "SMTP-AUTH" has the user provide a separate username and password for the SMTP server.Most email providers don't care who uses their SMTP server to send a message to somebody in the same domain, so it may look like everything is working until you try to send a message to somebody in another domain. If you get an error message that looks roughly like "5.7.1 Unable to relay" or "550 5.7.1 Relaying prohibited" when trying to send a message it probably means the SMTP server couldn't authenticate you as a legitimate user. However, nowadays that would be abused by spammers so many SMTP servers require the user to authenticate themselves whenever they send a message to somebody in another domain. At one time this was a common configuration. Please check the message and try again.Īn open mail relay is an SMTP server configured to allow anyone on the internet to relay (send) a message using it. 5.7.1 END-OF-MESSAGE: End-of-data rejected: user not permitted to relay.
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