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551 User not local; please try <forward-path> 552 Requested mail action aborted: exceeded storage allocation 553 Requested action not taken: mailbox name not allowed 554 Transaction has failed (Or, in the case of a connection-opening response, "No SMTP service here") 554 5.3.4 Message too big for system [4] 556 Domain does not accept mail [5]
When you get a message from a "MAILER-DAEMON" or a "Mail Delivery Subsystem" with a subject similar to "Failed Delivery," this means that an email you sent was undeliverable and has been bounced back to you.
The relay need not actually be used for sending spam to be blacklisted; instead, it may be blacklisted after a simple test that just confirms open access. [ 8 ] [ better source needed ] This trend reduced the percentage of mail senders that were open relays from over 90% down to well under 1% over several years. [ 9 ]
A relay server typically determines which server to connect to by looking up the MX (Mail eXchange) DNS resource record for each recipient's domain name. If no MX record is found, a conformant relaying server (not all are) instead looks up the A record. Relay servers can also be configured to use a smart host.
As a result, spam and worms, while not initially a problem, had become a plague by the late '90s. [2] Before SMTP AUTH, a relay client had to be identified by IP address, which is only practical for email services provided by the same Internet service provider (ISP) supplying the connection, or else using specific hacks, such as POP before SMTP.
Gmail, for example, continues to get listed and delisted [9] [10] because they refuse abuse reports. [11] However, smaller networks may still be unwittingly blocked. Because spammers use viruses, malware , and rootkits to force compromised computers to send spam, SORBS lists the IP addresses of servers that the infected system uses to send its ...
A rule of thumb in determining if a reply fits into the 4xx or the 5xx (Permanent Negative) category is that replies are 4xx if the commands can be repeated without any change in command form or in properties of the User or Server (e.g., the command is spelled the same with the same arguments used; the user does not change his file access or ...
Although the SMTP is a mature technology, counting more than thirty years, its architecture is increasingly strained by both normal and unsolicited load. [2] The email systems have been enhanced with reputation systems tied to the actual sender of the email, with the idea of recipient's email servers rejecting the email when a forged sender is used in the protocol.