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  Freeware eMail CRM Maximize the life-time value of your clients and getting them to smile at you Art of eMail CRM Applying minimum efforts for maximum result, at the shortest time? emails eMail Bolts & Nuts Interesting emails stuff that you should  know eMail Broadcast FAQ's eMail Marketing Tips
Great email strategies to help you increase sales
 
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Page 1/3 - (This page) RFC defined ESMTP Status Error Codes. The first number generally tells whether the server accepted the command and if it could manage

Page 2/3 -  New enhanced ESMTP Status /Error Codes and descriptions defined by RFC Protocol

Page 3/3 - Request for Comment (RFC)
A document outlining a standard and proposed standard to an existing standard.

 

RFC defined SMTP Status Error Codes

SMTP protocol specific response code design provides some useful (numeric) codes used for reporting mail (delivery status) system errors (Protocol a method of sending and receiving data).

SMTP is a simple ASCII protocol. SMTP is a protocol governing electronic mail transmission and reception (sending and receiving emails between mail servers).

ASCII is a standard developed by the American National Standards Institute ANSI to define how computers write & read characters --used by most OS (but not by Windows NT)

Operational Sequent of SMTP Simple Mail Transfer Protocol

How two MTAs (Message Transfer Agent) communicate with each other using a single TCP connection?

 

 
ESMTP Status Error Codes Command Group for data receive reply codes
 
Definition of extension to the SMTP service RFC-821
 
Winsock Error Codes
 
Mail Object Error Message
eMail Bolts & Nuts FAQ's
How to manage and clean bounced undelivered emails? Understand why emails get bounced
How to use your desktop PCs as an email server and bypass your ISP email server, a simple process using a free mail server program
How to test your message and see if it gets deleted by broad based anti-spam filters?
A one page email course. Everything you wanted to know about emailing in a "nut shell"
Quick guide to: dig finger traceroute ping whois nslookup IP block FTP SMTP relay TCP/IP Port
How to embed email tracking code into your email? Invisible counters, codes, scripts to track viewer
Send HTML or TEXT email using formatted HTML email, you can send an entire webpage
How to embed images into HTML email for faster emailing? Prevent displaying linked-site in recipient email client status bar
RFC defined ESMTP, SMTP Status Email Error Codes? These codes are used to provide informative explanations of error conditions
How email works?  Delivery of each email is done by your ISP mail server, first establishing a conversation through your recipient port 25
Some spiders visit site after site, collecting email addresses and controlling these rogue spiders spam bots or email harvesters with robot.txt
About TCP/IP and mail server port numbers? A number between 1 and 65535 which identifies to the receiving computer what function to perform
  1. Email is delivered by the source host (sender) establishing a TCP connection to port 25 of the (recipient) destination host and wait...
     
  2. An email daemon speaking SMTP simple ASCII rfc 821 listening at port 25 on the (recipient) destination hose identify itself and tell the (sender) whether it will accept mail....
     
  3. *If not* Server-time-out--the sending mail server terminate the connection and try again later, after a predefined undeliverable attempts--any undeliverable message will be returned with an error report containing the first part (message headers) to the sender.
     
  4. If the (recipient) mail server is willing to accept the mail, the (sender) mail server sends the email address of the recipient...
     
  5. If it is a valid recipient email address, the (recipient) mail server gives a go-ahead signal...
     
  6. Message is sent and acknowledged.

*If not*--There are no standard mechanism for reporting mail system errors except for the limited codes consisting of three numbers offered by SMTP with specific text descriptions sent in mail messages.

Because of its limitations, the majority of each code delivery report may indicate several other error conditions as well as different mail server using their own text description.

The first number generally tells whether the server
accepted the command and if it could manage it.

2nd number - The server has completed the task successfully.

 

 

 

 

*Server-time-out*
If the sending and receiving mail server has different timeouts, one of them may give-up while the other is still trying and unexpectedly terminate the connection.

 

eMail Bolts & Nuts FAQ's
How to manage and clean bounced undelivered emails? Understand why emails get bounced
How to use your desktop PCs as an email server and bypass your ISP email server, a simple process using a free mail server program
How to test your message and see if it gets deleted by broad based anti-spam filters?
A one page email course. Everything you wanted to know about emailing in a "nut shell"
Quick guide to: dig finger traceroute ping whois nslookup IP block FTP SMTP relay TCP/IP Port
How to embed email tracking code into your email? Invisible counters, codes, scripts to track viewer
Send HTML or TEXT email using formatted HTML email, you can send an entire webpage
How to embed images into HTML email for faster emailing? Prevent displaying linked-site in recipient email client status bar
RFC defined ESMTP, SMTP Status Email Error Codes? These codes are used to provide informative explanations of error conditions
How email works?  Delivery of each email is done by your ISP mail server, first establishing a conversation through your recipient port 25
Some spiders visit site after site, collecting email addresses and controlling these rogue spiders spam bots or email harvesters with robot.txt
About TCP/IP and mail server port numbers? It is a number between 1 and 65535 which identifies to the receiving computer what function you want to perform
 
 

3rd number - The server has understood the request but require further information to complete it.

4th number - The server has encountered a temporary failure. If the command is repeated without any change,
it might be completed.

5th number - The server has encountered an error.

The second number gives more information and its six possible values are:

0 A syntax error has occurred.

1 Indicates an informational reply, i.e. to a HELP request.

2 Refers to the connection status.

3 Unspecified.

4 Unspecified.

5 Refers to the status of the mail system
   as a whole and the mail server in particular.

The third number show more graduations of the mail transfer status to return a more detailed report as detailed in the ESMTP server response codes defined in RFC 821 and later extensions.

Example of an older SMTP response text description for the first number.

2.x.x    Success (The server has completed the task).

4.x.x   Persistent Transient Failure
(The server has encountered a temporary failure).

5.x.x   Permanent Failure
(The server has encountered an error).

 

eMail Bolts & Nuts FAQ's
How to manage and clean bounced undelivered emails? Understand why emails get bounced
How to use your desktop PCs as an email server and bypass your ISP email server, a simple process using a free mail server program
How to test your message and see if it gets deleted by broad based anti-spam filters?
A one page email course. Everything you wanted to know about emailing in a "nut shell"
Quick guide to: dig finger traceroute ping whois nslookup IP block FTP SMTP relay TCP/IP Port
How to embed email tracking code into your email? Invisible counters, codes, scripts to track viewer
Send HTML or TEXT email using formatted HTML email, you can send an entire webpage
How to embed images into HTML email for faster emailing? Prevent displaying linked-site in recipient email client status bar
RFC defined ESMTP, SMTP Status Email Error Codes? These codes are used to provide informative explanations of error conditions
How email works?  Delivery of each email is done by your ISP mail server, first establishing a conversation through your recipient port 25
Some spiders visit site after site, collecting email addresses and controlling these rogue spiders spam bots or email harvesters with robot.txt
About TCP/IP and mail server port numbers? It is a number between 1 and 65535 which identifies to the receiving computer what function you want to perform
 
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The number 5.x.x at the beginning of the specified SMTP protocol response code is about the only thing you can go by, because different mail server can use their own text description with the second and third number.

Example of new ESMTP response

Extended SMTP (ESMTP) consists of several extensions to the basic SMTP protocol. All of the extensions are optional.

SMTP servers may support any extension that it chooses or none at all. See: Definition of ESMTP

501 5.5.4  Syntax error

501 Syntax error represent the enhanced SMTP (ESMTP)status code

5.5.4 represent the old SMTP status code

Page 1/3 - (This page) RFC defined ESMTP Status Error Codes. The first number generally tells whether the server accepted the command and if it could manage

Page 2/3 - New enhanced ESMTP Status Error Codes and descriptions defined by RFC Protocol

Page 3/3 - (This page)  Request for Comment (RFC)
A document outlining a standard and proposed standard to an existing standard.

 

Spam-tracking 103 WHOIS tool nslookup and traceroute freeware download

 

whois.internic.net or network solutions are network registries to find out contact info for current domain or IP address

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nslookup a DNS tool that Perform forward and reverse DNS queries for the current address (this will usually give you the IP address of a hostname)

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traceroute finds the route packets take between you and the selected address

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Email in a "nut shell" a one page course about emailing. Everything you wanted to know about emailing.

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How email works? Delivery of each email is done by your ISP mailserver establishing a conversation through (port 25) of your recipient mail server

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Free2-Try 100% effective. The easiest way to Stop Spam getting into your PC. I recommend it.

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Free eBook Sun Tzu Art of War Commanders without thoughtful strategy invite defeat.

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