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Domain Name System blocklist. A Domain Name System blocklist, 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. [ 1]
Bounce message. A bounce message or just "bounce" is an automated message from an email system, informing the sender of a previous message that the message has not been delivered (or some other delivery problem occurred). The original message is said to have "bounced". This feedback may be immediate (some of the causes described here) or, if ...
DomainKeys Identified Mail ( DKIM) is an email authentication method designed to detect forged sender addresses in email ( email spoofing ), a technique often used in phishing and email spam . DKIM allows the receiver to check that an email that claimed to have come from a specific domain was indeed authorized by the owner of that domain. [ 1]
Greylisting (email) Greylisting is a method of defending e-mail users against spam. A mail transfer agent (MTA) using greylisting will "temporarily reject" any email from a sender it does not recognize. If the mail is legitimate, the originating server will try again after a delay, and if sufficient time has elapsed, the email will be accepted.
Gmail and Yahoo are two examples of free email services with a public domain. Individual and personal use is more appropriate for these. Large mailboxes are housed on a server as part of shared hosting email services. Because they are all hosted on the same server, those using a shared hosting email service share IP addresses.
The domain name (the part appearing to the right of @ in an email address) defines the target server(s) [2] for the corresponding class of addresses. A domain may also define backup servers; they have no mailboxes and forward messages without changing any part of their envelopes. [3]
A message submission agent ( MSA ), or mail submission agent, is a computer program or software agent that receives electronic mail messages from a mail user agent (MUA) and cooperates with a mail transfer agent (MTA) for delivery of the mail. It uses ESMTP, a variant of the Simple Mail Transfer Protocol (SMTP), as specified in RFC 6409.
SMTP Authentication. SMTP Authentication, often abbreviated SMTP AUTH, is an extension of the Simple Mail Transfer Protocol (SMTP) whereby a client may log in using any authentication mechanism supported by the server. It is mainly used by submission servers, where authentication is mandatory. [1]