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Hello i got something i would like to share:

I have for example 2 domains
- salt.be
- pepper.be

Know i created 1 emailbox for salt -> info@salt.be ... No problems so far :-)

When i login to roundcube with info@salt.be there is an option identity, that is the place where you can add other email domains.
So what i did is i add an other identity what i would creat emails from.
-> info@pepper.be

After this i can choose from what domain name i am using to send 1 email. (Again no problems here)

But when i create a custom application and it needs to send some emails in the name of pepper the problems kicks in.

I use the login for Salt to send emails from info@pepper.be (because i added 1 identity)

This returns: <info@pepper.be>: sender address rejected: not owned by user info@salt.be

So this is what i do not understand

With iredmail webmail i can send mails from pepper.be but external tool with authentication i can't.

When i send emails in name from salt.be -> there is no problem at all.

Extra info:
I own both domains, on iredmail !

my questions are:
1) what is the best practice here ?
2) What is the purpose of using identiy in roundcube ?

Kind regards,

Kris