SMTP error codes are not an exact science, because different servers can assign different meanings to the same error code.
However, there are things that are likely to be true, and we are going to talk about them. The most likely reason for this error is that recipients’ spam filters didn’t let your message through.
This document defines XMPP's core protocol methods: setup and teardown of XML streams, channel encryption, authentication, error handling, and communication primitives for messaging, network availability ("presence"), and request-response interactions. Further information on Internet Standards is available in Section 2 of RFC 5741. A remote server or service specified as part or all of the JID of the intended recipient (or needed to fulfill a request) was resolved but communications could not be established within a reasonable amount of time (e.g., an XML stream cannot be established at the resolved IP address and port, or an XML stream can be established but stream negotiation fails because of problems with TLS, SASL, Server Dialback, etc.); the associated error type SHOULD be "wait" (unless the error is of a more permanent nature, e.g., the remote server is found but it cannot be authenticated or it violates security policies).
Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at ) if sending one of the latter errors would provide information about the intended recipient's network availability to an entity that is not authorized to know such information (for a more detailed discussion of presence authorization, refer to [XMPP‑IM] The requesting entity is not authorized to access the requested service because a prior subscription is necessary (examples of prior subscription include authorization to receive presence information as defined in [XMPP‑IM] The error condition is not one of those defined by the other conditions in this list; any error type can be associated with this condition, and it SHOULD NOT be used except in conjunction with an application-specific condition.
Thunderbird looks up the SMTP server's name to find its network address (IP address).
I'm trying to buy the Samsung Galaxy SIII online, create a new service plan, and have my number ported.
When you are troubleshooting, be careful to identify the error message exactly. Different things can go wrong at each stage, so each stage has different error messages.
When a connection fails, Thunderbird provides you with up to four pieces of information about the failure.
For troubleshooting techniques, see: Cannot send mail Some of these error messages are misleading.
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The Extensible Messaging and Presence Protocol (XMPP) is an application profile of the Extensible Markup Language (XML) that enables the near-real-time exchange of structured yet extensible data between any two or more network entities. This document is a product of the Internet Engineering Task Force (IETF). It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). The requesting entity is not authorized to access the requested service because prior registration is necessary (examples of prior registration include members-only rooms in XMPP multi-user chat [XEP‑0045] A remote server or service specified as part or all of the JID of the intended recipient does not exist or cannot be resolved (e.g., there is no _xmpp-server._tcp DNS SRV record, the A or AAAA fallback resolution fails, or A/AAAA lookups succeed but there is no response on the IANA-registered port 5269); the associated error type SHOULD be "cancel".