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Sending Email Errors: Difference between revisions
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<indicator name="Faults">[[File:Menu-email.svg|link=:Category:Email|30px|Back up to the Email Category]]</indicator>
__NOTOC__
[[File:e-mail-icon.png|64px|link=:Category:Email]]
=Error Codes=
Error codes, CA1, CA2, CA3 and BO are designed to help stop the spread of spam and 'backscatter' through our email servers. We do welcome feedback on this.
==CA1==
In most cases, we would also send an email to the customer with details of why the account has been blocked.
This suggests that you are [[Sending Email|sending email]] through smtp.aa.net.uk with authentication. but the system has detected a high
'''Possible Compromised Account?'''
==CA2==
An IP address has been blocked from sending email through smtp.aa.net.uk due to
*a number of high spam scoring messages in a short period of time, around 20 high spam scoring messages in an hour,
*or, a high number of emails to invalid email addresses, around 20 failed messages in an hour,
(These figures are subject to change without notice.)
We reject the message with:
Error CA2 see: http://wiki.aa.org.uk/Sending_Email_Errors x.x.x.x is blocked from sending. Probably due to sending spam messages.
In most cases, we would also send an email to the customer with details of why the IP has been blocked. In many cases the IP is a third party unknown to the customer who has managed to obtain
==CA3==
A Mailbox has been blocked from sending email through smtp.aa.net.uk due to it sending a number of high spam scoring messages over a period of time, around 40 high spam scoring messages over a period of 6 hours, however these figures are subject to change without notice. The reason for the long time period is that it is known for compromised accounts to be sued to 'dribble' spam messages at low rates.
We reject the message with:
Error CA3 see: http://wiki.aa.org.uk/Sending_Email_Errors
In most cases, we would also send an email to the customer with details of why the Mailbox has been blocked.
'''Possible Compromised Account?'''
The email account may be compromised and a third party may be using your account to send lots of junk email. Typically a junk sender will send lots of emails and will be scored highly by are spam checking software. To help prevent spam we have blocked the account from sending further email. Please contact support for more details, we would request you to change your email password before we unblock the account.
==BO1==
This means that we have blocked sending of a non-delivery report type message. This would be an email, typically from a customer server, that is a bounc eback message. Rather than rejecting the incoming message at SMTP time, the customer mail server has accepted the incoming message and then decided that it was now wanted, and generated a new email back to the original sender saying that the message has not been delivered.
We don't allow sending of bounces back messages due to backscatter problems. -
In these cases, please configure your email server to reject mail at SMTP time, or to send messages by MX records rather than relaying through smtp.aa.net.uk.
We catch this by matching a null sender address,
DELIVERY FAILURE
There may be others...
==Greylisting==
You came here probably after seeing a mail of yours being rejected with a message like this:
Greylisted for 300 seconds
The mail server generating this error message is using a system called Greylisting to filter spam and viruses. It relies on Mail Servers behaving according to the standards and usually doesn't require any action by the user. Your mails should only possibly be delayed.
[[Category:Email]]
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