[Users] How to hide sender IP address and host name?

[Slavko]

Dňa 21. 2. 2018 o 0:00 Removed GDPR napísal(a):
>> Sure you can - just use Tor. :)
> 
> How do you make sure your mail will be delivered? Tor nodes are often
> blacklisted for spam.

I still do not understand what is this thread about...

From RFC 5321:

3.2.  Client Initiation

   Once the server has sent the greeting (welcoming) message and the
   client has received it, the client normally sends the EHLO command to
   the server, indicating the client's identity.

   ...

   In the EHLO command, the host sending the command identifies itself;

4.1.1.1.  Extended HELLO (EHLO) or HELLO (HELO)

   These commands are used to identify the SMTP client to the SMTP
   server.  The argument clause contains the fully-qualified domain name
   of the SMTP client, if one is available.  In situations in which the
   SMTP client system does not have a meaningful domain name (e.g., when
   its address is dynamically allocated and no reverse mapping record is
   available), the client SHOULD send an address literal (IPv4 or IPv6).

4.4.  Trace Information

   When an SMTP server receives a message for delivery or further
   processing, it MUST insert trace ("time stamp" or "Received")
   information at the beginning of the message content, as discussed in
   Section 4.1.1.4.

   This line MUST be structured as follows:

   o  The FROM clause, which MUST be supplied in an SMTP environment,
      SHOULD contain both (1) the name of the source host as presented
      in the EHLO command and (2) an address literal containing the IP
      address of the source, determined from the TCP connection.

   ...

In short, client (the CM in this case) have to identify itself with FQDN
or IP (if FQDN is not available). And the server have to mark this ID
and client's IP in message headers (usually Received header). Anything
other breaks RFC.

One cannot compare it with the webmail behavior, because it can use
local access (not SMTP) to mail server, where the another rules are
applied. And, of course, the clients assess webmail by HTTP, which is
another story.

If you steel need to hide hostname (vhich is used to get FQDN) and/or
IP, ask to change RFC...

regards
Slavko



-- 
Slavko
http://slavino.sk

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