Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.
View this topic in a long page with up to 500 replies per page Create new topic
1 | 2 
21235 posts

Uber Geek
+1 received by user: 4271

Trusted
Subscriber

  Reply # 1927803 1-Jan-2018 22:51
Send private message

What does RFC say the mail server should do if it has accepted an email and then finds that the mailbox is closed?





Richard rich.ms

394 posts

Ultimate Geek
+1 received by user: 110


  Reply # 1928109 2-Jan-2018 17:06
Send private message

richms:

 

What does RFC say the mail server should do if it has accepted an email and then finds that the mailbox is closed?

 

 

RFC 5321 says:

 

"If an SMTP server has accepted the task of relaying the mail and later finds that the destination is incorrect or that the mail cannot be delivered for some other reason, then it MUST construct an "undeliverable mail" notification message and send it to the originator of the undeliverable mail (as indicated by the reverse-path)."


1788 posts

Uber Geek
+1 received by user: 126


  Reply # 1928117 2-Jan-2018 17:40
Send private message

Well, to my mind, "Mailbox closed" satisfies this 'notification message' requirement and in fact provides the sender with understandable information?

 

 


4904 posts

Uber Geek
+1 received by user: 1537


  Reply # 1928120 2-Jan-2018 17:49
One person supports this post
Send private message

The RFC goes on to specify what the format of that report should be.

 

There's standards for a reason - so that any server from any manufacturer can talk to another, and nothing gets lost in the translation. @Rikkles, bear in mind that the sender may not speak English, or may not be human, so a human readable English message is hopeless for some recipients. The sender's mail server can convert the appropriate non delivery report to a human readable message.

 

EDIT: Link to RFC


394 posts

Ultimate Geek
+1 received by user: 110


  Reply # 1928122 2-Jan-2018 17:51
Send private message

Rickles:

 

Well, to my mind, "Mailbox closed" satisfies this 'notification message' requirement and in fact provides the sender with understandable information?

 

 

It does not provide the sending server with understandable information. It needs to be in a certain format so servers and other automated software can deal with it correctly.

 

For example sending to my made up noone@pole.net.nz address, my provider, FastMail, will bounce with a user friendly message as follows:

 

This is the mail system at host mailuser.nyi.internal.

 

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

 

For further assistance, please send mail to postmaster.

 

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

 

The mail system

 

<noone@pole.net.nz>: host mailuser.nyi.internal[/var/run/lmtpforward/outgoing]
said: 550 5.1.1 <noone@pole.net.nz>: Recipient address rejected: User
unknown in virtual mailbox table via compute2 (in reply to end of DATA
command)

 

And attached to that message will be a special delivery report file that says, in machine readable, format:

 

Reporting-MTA: dns; mailuser.nyi.internal
X-Postfix-Queue-ID: EBDB89412B
X-Postfix-Sender: rfc822; james@pole.net.nz
Arrival-Date: Mon, 1 Jan 2018 23:44:41 -0500 (EST)

 

Final-Recipient: rfc822; noone@pole.net.nz
Action: failed
Status: 5.1.1
Remote-MTA: dns; mailuser.nyi.internal
Diagnostic-Code: smtp; 550 5.1.1 <noone@pole.net.nz>: Recipient address
rejected: User unknown in virtual mailbox table via compute2

 

Servers can then read the delivery report file and take the appropriate action automatically.

 

That is an example of a system in compliance with the RFC. Vodafone is most certainty not in compliance with the RFC as (I presume) it does not include the correct delivery report attachment.

 

- James


1788 posts

Uber Geek
+1 received by user: 126


  Reply # 1928126 2-Jan-2018 18:06
Send private message

Thanks James ... interesting subject.




3209 posts

Uber Geek
+1 received by user: 616

Trusted

  Reply # 1928192 2-Jan-2018 20:13
Send private message

James is correct - if the correct process was followed by vodafone, our customer would be notified in the correct way that they have a stale email address. The process we have set up for them works for any other mailbox that is closed because the destination server returns the correct error code. 

 

Vodafone isnt responding with the correct error code during the smtp session so our correct process based on the RFC cant be actioned. 





Ray Taylor
Taylor Broadband (rural hawkes bay)
www.ruralkiwi.com

There is no place like localhost
For my general guide to extending your wireless network Click Here




1 | 2 
View this topic in a long page with up to 500 replies per page Create new topic

Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

Microsoft Dynamics 365 Business Central launches
Posted 10-Jul-2018 10:40


Spark completes first milestone in voice platform upgrade
Posted 10-Jul-2018 09:36


Microsoft ices heated developers
Posted 6-Jul-2018 20:16


PB Technologies charged for its extended warranties and warned for bait advertising
Posted 3-Jul-2018 15:45


Almost 20,000 people claim credits from Spark
Posted 29-Jun-2018 10:40


Cove sells NZ's first insurance policy via chatbot
Posted 25-Jun-2018 10:04


N4L helping TAKA Trust bridge the digital divide for Lower Hutt students
Posted 18-Jun-2018 13:08


Winners Announced for 2018 CIO Awards
Posted 18-Jun-2018 13:03


Logitech Rally sets new standard for USB-connected video conference cameras
Posted 18-Jun-2018 09:27


Russell Stanners steps down as Vodafone NZ CEO
Posted 12-Jun-2018 09:13


Intergen recognised as 2018 Microsoft Country Partner of the Year for New Zealand
Posted 12-Jun-2018 08:00


Finalists Announced For Microsoft NZ Partner Awards
Posted 6-Jun-2018 15:12


Vocus Group and Vodafone announce joint venture to accelerate fibre innovation
Posted 5-Jun-2018 10:52


Kogan.com to launch Kogan Mobile in New Zealand
Posted 4-Jun-2018 14:34


Enable doubles fibre broadband speeds for its most popular wholesale service in Christchurch
Posted 2-Jun-2018 20:07



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.