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Frequently asked questions
As used in this specification, an “address” is a character string that identifies a user to whom mail will be sent or a location into which mail will be deposited. The term “mailbox” refers to that depository. The two terms are typically used interchangeably unless the distinction between the location in which mail is placed (the mailbox) and a reference to it (the address) is important. An address normally consists of user and domain specifications. The standard mailbox naming convention is defined to be “local- [email protected]”: contemporary usage permits a much broader set of applications than simple “user names”. Consequently, and due to a long history of problems when intermediate hosts have attempted to optimize transport by modifying them, the local-part MUST be interpreted and assigned semantics only by the host specified in the domain part of the address.
An SMTP reply is an acknowledgment (positive or negative) sent from receiver to sender via the transmission channel in response to a command. The general form of a reply is a numeric completion code (indicating failure or success) usually followed by a text string.
The codes are for use by programs and the text is usually intended for human users. Recent work has specified further structuring of the reply strings, including the use of supplemental and more specific completion codes.
SMTP commands and, unless altered by a service extension, message data, are transmitted in “lines”. Lines consist of zero or more data characters terminated by the sequence ASCII character “CR” (hex value 0D) followed immediately by ASCII character “LF” (hex value 0A).
This termination sequence is denoted as in this document.
Conforming implementations MUST NOT recognize or generate any other character or character sequence as a line terminator. Limits MAY be imposed on line lengths by servers.
In addition, the appearance of “bare” “CR” or “LF” characters in text (i.e., either without the other) has a long history of causing problems in mail implementations and applications that use the mail system as a tool. SMTP client implementations MUST NOT transmit these characters except when they are intended as line terminators and then MUST, as indicated above, transmit them only as a sequence.
For the purposes of this specification, a host is a computer system attached to the Internet (or, in some cases, to a private TCP/IP network) and supporting the SMTP protocol. Hosts are known by names (see “domain”); identifying them by numerical address is discouraged.
A domain (or domain name) consists of one or more dot-separated components. These components (“labels” in DNS terminology ) are restricted for SMTP purposes to consist of a sequence of letters, digits, and hyphens drawn from the ASCII character set. Domain names are used as names of hosts and of other entities in the domain name hierarchy. For example, a domain may refer to an alias (label of a CNAME RR) or the label of Mail eXchanger records to be used to deliver mail instead of representing a host name.
The domain name, as described in this document and in, is the entire, fully-qualified name (often referred to as an “FQDN”). A domain name that is not in FQDN form is no more than a local alias.
Local aliases MUST NOT appear in any SMTP transaction.