How to avoid the "mail loops back to myself" problem ?

Hi,

I using i-MSCP 1.1.14, but I generaly don't use mail service.
Example :
- the domain.com is hosted by the server which running i-MSCP
- the mails like contact@domain.com are hosted by another server

From ssh on the i-MSCP server, the command :

... make an error :

I read than i-MSCP 1.1.14 have an option to set external mx server, but I didn't find the way to use it correctly to solve my problem.
I don't understand what I should indicate as "External email server host"

For information, my external mail provider is Gandi.net

Nuxwin : I sent you an email

I read this : Seperated Web and Mail Server - Cant send mails

In my case, the external mail server is Gandi.net
The point is Gandi.net's SMTP server need authentification.
I tried to put "mail.gandi.net" on the "External email server host" field but now, I have this :

Quote

You want configure a smarthost, isn't it?

I'm not sure to understand what you mean by "smarthost"

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eg any mail sent from your i-MSCP server must be relayed through gandi mail server?

I thing that's it

Because it's a long time problem with VHCS, and later iscpCP Omega and finaly i-MSCP, I will try to explain very clearly my purpose.

On my i-MSCP server, I generaly don't use local mail server.
Instead, I'm using an external webserver.
In my experience, it's very boring to manage problem on a mail server (or migrate mailbox), so I prefer externalize this service to a trust compagny

The problem, with i-MSCP, is when the server has to sent a mail to a domain hosted by itself (for example, after a form validation or when you ask a password reset).

You can easily reproduce the problem by sending manually an email from ssh console :

... where mydomain.com is hosted by i-MSCP, but the mailbox me@mydomain.com doesn't exist on this server, but elsewhere, at an external provider.

On the log, you will have :

I dream (from long time ago) of a fonctionnality to set an option like this to a domain : "Don't use local MX for this domain. Send the mails outside, to the Internet"

I try to use the option "external mail server" without success because my external smtp server need an authentification (Nuxwin said he will help me to test this option with a hook )
But in my opinion, it could be more simple to just say "lest go the mail outside with local smtp server, and trust the internet to find the good MX".

I really need a solution to do this king of stuff.
For now, I have found a durty roundabout : if I need to send a mail to me@mydomain.com from the server (where mydomain.com is hosted by i-MSCP), I create a mail redirection elsewhere from me.mydomain@otherdomain.com to me@mydomain.com (where otherdomain.com IS NOT on the i-MSCP server)
But is not easy to ask your customer to use this durty tip

Quote

This can stay only a dream because i-MSCP must know at least the relay
(server which is responsible to send mails for the domain). Nothing is
magic

OK. I can understand.

Nevertheless, I remember on my old ispCP, I used a tip like this :

Quote

1/ edit /etc/postfix/ispcp/domains
2/ comment domain (to have the behavior described here on it)
3/ cp /etc/postfix/ispcp/domains /etc/ispcp/postfix/working
4/ cd /etc/postfix/ispcp
5/ postmap domains

Until my migration to i-MSCP, I use this tip as roundabout with success.

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What you need is a per sender transport map (with SASL authentication). This is currently not supported by i-MSCP. I'll see if I can implement that ASAP.

OK thanks, because it's not very confortable for now :o/
I'll stay connected

If I understand, if I install the Postfix Smarthost hook, all my users will used my external mail provider (with SASL authentification) and it won't be possible to use it "per user/domain".
Which is problematic in my case because my external mail provider is setting limits to avoid spam.
Am I right ?