Stan Haimes, MD via Exim-users <[email protected]> (Fr 30 Apr 2021 07:42:51 CEST): > I have a need for a slightly different implementation of Opportunistic TLS > in EXIM. I am also willing to provide compensation for its development and > would be happy to donate the code to public distribution if it would be > useful to others. > > For most messages, sending the outgoing email by Opportunistic TLS would be > desirable and perfect. > > However, if the Subject field contains "[Secure]", I would like that to > trigger different message handling by EXIM. The presence of this character > string in the Subject field would indicate that the sender was requiring > that this message be sent via TLS or not at all. As a result, if the email > could be sent via Forced (Mandatory) TLS, the email submission would > complete in the usual manner. However, if the attempted TLS connection was > not successful, the email would be redirected to the sender with an > indication that the secure TLS email transmission was not successful.
your're looking for something like this?:
begin transports
smtp:
driver = smtps
hosts_require_tls = ${if match{$h_subject:}{\N^\[secure\]\N}{*}}
Best regards from Dresden/Germany
Viele Grüße aus Dresden
Heiko Schlittermann
--
SCHLITTERMANN.de ---------------------------- internet & unix support -
Heiko Schlittermann, Dipl.-Ing. (TU) - {fon,fax}: +49.351.802998{1,3} -
gnupg encrypted messages are welcome --------------- key ID: F69376CE -
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