On Apr 20, 2008, at 04:31, Wilfried Mestdagh wrote:
> Can someone advice on how the best way to detect a circular mail?
>
> I have smtp server and the mailboxes are all GSM. Sms are sent to
> another smtp server who deliver it for email reader (pop3 or imap).
> When
> users send email the other smtp server delivers it to mine who send it
> then to the GSM's.
>
> But there could be circumstances (wrong settings by IT manager) that I
> deliver a mail the the other server who send it back and so on. The way
> around is also possible. For example by filling in a wrong domain or an
> IT manager email at wrong domain or so.
The common way is for the SMTP server (or Mail Delivery Agent) to add
an additional header with the sender's address, then ignore any
messages where the recipient is the same as the value in that header.
This is how most (properly configured) MDAs handle it. MailMan uses
"X-BeenThere" and Procmail uses "X-Loop". You may want to use your own
convention.
This is a lot more effective and efficient than having to scan the
entire "Received:" header stack. Plus, the RFC requires transport
servers in transit to include all "X" headers untouched.
dZ.
--
DZ-Jay [TeamICS]
http://www.overbyte.be/eng/overbyte/teamics.html
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