05-16-2012
Your question is still to general for these forums, but I will give you a general answer and maybe that will point you in the right direction. But I think maybe you need to find an expert that will consult with you for your specific needs.
Postfix is one of 3 major, free implementations of SMTP for UNIX. The others are sendmail and qmail. Of these, postfix has the best combination of flexibility and ease-of-configuration. All are available for Linux.
Postfix and sendmail are typically thought of as "MTAs" -- Mail Transport Agents. SMTP is a protocol designed for MTAs to talk with each other. (LMTP is another such protocol.) What you are asking for is a function typically provided by "MDAs" -- Mail Delivery Agents. These programs are delegated the responsibility of putting the mail into the right mailbox for the end-user. These programs typically do not interact with other systems or other computers -- only the system that the mail has been transported to (via the MTAs). Examples of such programs include
Take a look at the short Wikipedia article for these. You can start reading here:
Mail delivery agent - Wikipedia, the free encyclopedia
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LEARN ABOUT MOJAVE
curlopt_mail_from
CURLOPT_MAIL_FROM(3) curl_easy_setopt options CURLOPT_MAIL_FROM(3)
NAME
CURLOPT_MAIL_FROM - SMTP sender address
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_MAIL_FROM, char *from);
DESCRIPTION
Pass a pointer to a zero terminated string as parameter. This should be used to specify the sender's email address when sending SMTP mail
with libcurl.
An originator email address should be specified with angled brackets (<>) around it, which if not specified will be added automatically.
If this parameter is not specified then an empty address will be sent to the mail server which may cause the email to be rejected.
The application does not have to keep the string around after setting this option.
DEFAULT
blank
PROTOCOLS
SMTP
EXAMPLE
TODO
AVAILABILITY
Added in 7.20.0
RETURN VALUE
Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or CURLE_OUT_OF_MEMORY if there was insufficient heap space.
SEE ALSO
CURLOPT_MAIL_RCPT(3), CURLOPT_MAIL_AUTH(3),
libcurl 7.54.0 December 21, 2016 CURLOPT_MAIL_FROM(3)