In some cases, the MUA may be unable to generate finished messages e. Even when submitted messages are complete, local site policy may dictate that the message text be examined or modified in some way, e.
Such completions or modifications have been shown to cause harm when performed by downstream MTAs -- that is, MTAs after the first-hop submission MTA -- and are in general considered to be outside the province of standardized MTA functionality.
Document Information 2. Fully-Qualified Containing or consisting of a domain that can be globally resolved using the Domain Name Service; that is, not a local alias or partial specification. Conventions Used in This Document In examples, "C:" is used to indicate lines sent by the client, and "S:" indicates those sent by the server. Line breaks within a command example are for editorial purposes only. Examples use the 'example. Message Submission 3.
Submission Identification Port is reserved for email message submission as specified in this document. Messages received on this port are defined to be submissions. Although most email clients and servers can be configured to use port instead of 25, there are cases where this is not possible or convenient. For example, some sites might configure their MTAs to reject all RCPT commands for messages that do not reference local users, and configure their MSA to reject all message submissions that do not come from authorized users, with authorization based either on authenticated identity or the submitting endpoint being within a protected IP environment.
This is especially true for problems that are correctable by the MUA, for example, an invalid 'From' field. A message can be immediately rejected by returning a code to the MAIL command. MUAs need to generate null return-path messages for a variety of reasons, including disposition notifications. Except in the case where the MSA is unable to determine a valid return path for the message being submitted, text in this specification that instructs an MSA to issue a rejection code MAY be complied with by accepting the message and subsequently generating a bounce message.
That is, if the MSA is going to reject a message for any reason except being unable to determine a return path, it can optionally do an immediate rejection or accept the message and then mail a bounce. NOTE: In the normal case of message submission, immediately rejecting the message is preferred, as it gives the user and MUA direct feedback.
To properly handle delayed bounces, the client MUA needs to maintain a queue of messages it has submitted, and match bounces to them. Note that many contemporary MUAs do not have this capability. Authorized Submission Numerous methods have been used to ensure that only authorized users are able to submit messages. It allows the MSA to determine an authorization identity for the message submission, one that is not tied to other protocols.
IP address restrictions are very widely implemented, but do not allow for travelers and similar situations, and can be easily spoofed unless all transport paths between the MUA and MSA are trustworthy. Specifically, the client must do a POP authentication before an SMTP submission session, and not all clients are capable and configured for this. There is also a window during which an unauthorized user can submit messages and appear to be a previously authorized user.
Since it is dependent on the MUA's IP addresses, this technique is substantially as subject to IP address spoofing as validation based on known IP addresses alone see above. A frequent local convention is to accept single-level domains e.
Local conventions that permit single-level domains SHOULD reject, rather than expand, incomplete multi-level domains e. Section 3. If the MSA examines or alters the message text in way, except to add trace header fields, it SHOULD reject messages with illegal address syntax in address header fields. When addresses are resolved after submission of the message body, reply code with a suitable enhanced status code from [ SMTP-CODES ] is used after end-of-data, if the message contains invalid addresses in the header.
It can be very helpful to notify the administrator when problems are detected with local mail clients. This is another advantage of distinguishing submission from relay: system administrators might be interested in local configuration problems, but not in client problems at other sites.
Note that it is important to impose limits on such logging to prevent certain forms of denial of service DoS attacks. Check Message Data The MSA MAY issue an error response to the DATA command or send a failure result after end-of-data if the submitted message is syntactically invalid, or seems inconsistent with permissions given to the user if known , or violates site policy in some way. Reply code is used for syntactic problems in the data. Employment Training Panel Article 2.
A For training in an industry sector identified by the Panel as a funding priority in accordance with Unemployment Insurance Code Section b ; or.
B For training under a Critical Proposal within the meaning of Section This wage modification, including the determination of funding priority, shall be made on a case-by-case basis. Barriers may include mental or physical disability, illiteracy, limited English proficiency, limited math skills, or some similar impediment.
Notwithstanding the limitations under Section , the Panel may fund the same number of basic skills and literacy training hours as are funded for vocational skills training, on a per-trainee basis. An employee cannot be leased or assigned from a temporary employment agency or other provider.
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