On Fri, Sep 18, 2020 at 07:01:26PM +0300, Janis wrote:
> What I would like to achieve is to permit sender to set "mail from" the
> same value as his SASL auth username or some specially allowed "alias
> e-mail" addresses that are defined somewhere. For example, if user1 is
> allowed to respond for his company, he would authenticate as
> us...@domain.tld and could set "mail from" 1) us...@domain.tld or 2)
> i...@domain.tld.
>
> I can achieve this at the moment by writing both lines in login_maps
> file, but it feels kind of wrong way to do things. Is there a way not to
> duplicate Dovecot usernames and permit 1st case restriction in "mail
> from" something like permit_sasl_username_as_mail_from?
>
> I was looking directly at
> http://www.postfix.org/postconf.5.html#smtpd_sender_restrictions, but
> none of the options seemed right for this use case.
Did you also look at:
<http://www.postfix.org/postconf.5.html#smtpd_sender_login_maps>?
That text reads in part:
Optional lookup table with the SASL login names that own the sender
(MAIL FROM) addresses.
Specify zero or more "type:name" lookup tables, separated by
--------------------------------------
whitespace or comma. Tables will be searched in the specified order
until a match is found. With lookups from indexed files such as DB
or DBM, or from networked tables such as NIS, LDAP or SQL, the
following search operations are done with a sender address of
user@domain:
Therefore, you can use:
main.cf:
indexed = ${default_database_type}:${config_directory}/
pcre = pcre:${config_directory}/
smpd_sender_login_maps =
${pcre}same-as-sender.pcre,
${indexed}adhoc
same-as-sender.pcre:
# us...@example.org us...@example.org
/^(.*)$/ $1
adhoc:
# All the users allowed to send as "info@..."
i...@example.org us...@example.org, us...@example.org, ...
> Maybe if i scratched
> my head a bit, i could come up with some "tricky" SQL query as a
> workaround and use reject_sender_login_mismatch, but maybe i have just
> overlooked some simple setting, thus i ask for any input.
SQL can be a good option if it meshes well with the provisioning process
and the list of adhoc mappings is fairly dynamic.
--
Viktor.
