Sending Email Errors: Difference between revisions

(4 intermediate revisions by 2 users not shown)

Line 1:

<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]]

Line 6:

Line 7:

=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==

Line 24:

Line 27:

==CA2==

An IP address has been blocked from sending email through smtp.aa.net.uk due to it sending ~~a number of high spam scoring messages in a short period of time, around 20 high spam scoring messages in an hour, however these figures are subject to change without notice.~~

An IP address has been blocked from sending email through smtp.aa.net.uk due to the IP sending:

*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==

Line 50:

Line 57:

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. -ie, most of the time the message being rejected is spam, and so a reply to the spam just means that email is being sent to an invalid address anyway. This can cause our servers to be placed on to blacklists, and it is better practice to reject email at smtp time.

We don't allow sending of bounces back messages due to backscatter problems. -i.e., most of the time the message being rejected is spam, and so a reply to the spam just means that email is being sent to an invalid address anyway. This can cause our servers to be placed on to blacklists, and it is better practice to reject email at smtp time.

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, ie the sender email address is <>, and a list of known subject lines that are bounce back messages eg:

We catch this by matching a null sender address, i.e. the sender email address is <>, and a list of known subject lines that are bounce back messages e.g.:

DELIVERY FAILURE

Line 72:

Line 79:

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]]