On 1/29/2020 9:26 AM, Averlon wrote:
Dear all,
I have a client in my network, a technical device, which I can only
set some parameters to send mails (mailserver, port, sender-address,
receipient-address, …), but not manipulate or administrate.
I have a Postfix installation in my INTRANET, using port 25, just to
get e-Mails from clients and relay them to some relay-host of my
provider.
In general, the postfix works.
The client sends a curious telnet command string and I would need to
manipulate that when it is received by postfix to be able to perform
the relay conrrect.
+++
SMTP 70 C: MAIL FROM:<1e>
SMTP 68 S: 250 2.1.0 Ok
SMTP 67 C: RCPT TO:<D>
SMTP 68 S: 250 2.1.5 Ok
SMTP 72 C: RCPT TO:<status>
SMTP 68 S: 250 2.1.5 Ok
SMTP 77 C: RCPT TO:<diagnostics>
SMTP 68 S: 250 2.1.5 Ok
SMTP 70 C: RCPT TO:<ping>
SMTP 68 S: 250 2.1.5 Ok
SMTP 105 C: RCPT TO:<ping google-public-dns-a.google.com 1 1>
SMTP 94 S: 501 5.1.3 Bad recipient address syntax
SMTP 60 C: QUIT
+++
This is the communication of the client.
Now I would like to manipulate the “MAIL FROM” and the “RCPT TO” to
some form that works and eliminate the “ping …..” at all.
I have tried with
canonical_maps = regexp:/etc/postfix/av_canonical.cf
Look at
http://www.postfix.org/postconf.5.html#smtpd_command_filter
-- Noel Jones
