Disabling local email delivery in a persistent way?

I know this has been asked in a similar way and I'll link to the other thread(s) if I can find them.

Why would I like to disable local delivery?
The server is a webserver only, but we need it to send DKIM signed emails directly without passing through other smtpds.
For the case where a website (e.g. [email protected]) wants to send mail to another user at the same domain (e.g. [email protected]), I need to disable local delivery or postfix will try and fail to deliver those mails locally using maildrop.

I think this is a legitimate use-case, given that not every client who has their website hosted on this server wants to or can even provide an smtpd serving as a relay host or as an mta. So an all or nothing set-up as in "just disable email on the server" is not the correct answer to this problem.

While I do agree that a better solution would be to use a dedicated email server as a globally defined relay host, not everyone has the luxury of being able to or afford to doing that.

The way I have handled disabling local delivery is by commenting out these two settings in main.cf:

Code:

# DR - Disable local delivery for sender domains
#virtual_mailbox_domains = proxy:mysql:/etc/postfix/mysql-virtual_domains.cf
#virtual_mailbox_maps = proxy:mysql:/etc/postfix/mysql-virtual_mailboxes.cf

This works perfectly fine, except for when I update ISPConfig and ask it to reconfigure services…

Is there any way I could handle this today, or do we want to add a checkbox to globally disable local delivery and keep mail services enabled for remote delivery, or at least do this per client/domain ?

 

Thanks till.

I'm sure there are plenty of posts that explain how to solve almost any imaginable topic in this forum. It's just super hard to find the correct ones, at least for me, if one doesn't know what exact terms to search for.

I had found plenty of people asking about the same thing and being told to disable mail entirely, not a single thread where the answer was "change it and make it 'update-safe'!".

We've had this conversation before when I incorrectly complained about the lack of extensibility. I also ran into this issue when I found a, but not the correct install tutorial.

I'm just having a hard time using a forum as a source of documentation.

Edit: sorry for switching accounts, I wasn't even aware I had another one.

 

Till, you may be right about everything, and yet, I feel like your sarcasm and snide are entirely misdirected and unasked for.

Especially since I conceded that I've been in error before and that fora are not the ideal tool for me personally without generalizing that claim to everybody.

I could use your own examples as counter-arguments, show how Google searches turn up a lot of posts that do not hold any useful answers, how the same questions are asked over and over again, despite the correct answer being in a post just a simple search away,... but I don't want that to be met with another snide reply, so I won't.

Just one from the last post you linked to:

I think you're forgetting that you have gotten the lingua (search terms) down because you're working with this all day, every day while others are used to other tools and other means of information management and retrieval.

I don't think mockery is the way you're going to build the community and get people to buy business support.

I'm saddened, because I thought I wanted to contribute something back to ISPConfig, other than the manuals I've bought repeatedly over the years, but now I'm not so sure anymore, seeing how everything is perfect already anyway.

 

Meh... Excuses, excuses...