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[FR] Send-only domains #2813
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meta/closed due to age or inactivityThis issue / PR has been closed due to inactivityThis issue / PR has been closed due to inactivitymeta/needs triageThis issue / PR needs checks and verification from maintainersThis issue / PR needs checks and verification from maintainersmeta/staleThis issue / PR has become stale and will be closed if there is no further activityThis issue / PR has become stale and will be closed if there is no further activitypriority/low
Feature Request
There is a problem delivering emails to the correct mailserver when the domain exists in the sending mailserver.
Context
If a domain exists in a mailserver, the server becomes its "final destination", catching all the emails for that domain and not relaying them (if needed).
Is your Feature Request related to a Problem?
The fact that every domain ends up in the
virtual_mailbox_domainslist (https://www.postfix.org/postconf.5.html#virtual_mailbox_domains) create problems in the following case:I have my domain
example.orgwith all the mailboxes onmailserver1. I also usemailserver2only to send emails (like from[email protected]).The problem is that when I send an email from
[email protected]to[email protected]usingmailserver2it fails becasemailserver2can't finduser.Describe the Solution you'd like
There should be a way to prevent domains to be in the
virtual_mailbox_domainslist, marking them as send-only (as they wouldn't be able to receive any emails).Are you going to implement it?
Yes, I already have.
Giotino@b651e3e
I created a new configuration file
sendonly-domains.cfwith the list of domains that shouldn't be in thevirtual_mailbox_domainslist.What are you going to contribute??
In addition to the code in the commit, I can add the option to add send-only domains to the setup.sh and then open a PR.
Additional context
Alternatives you've considered
I tried to set a relay for the domain to the mailserver with the mailboxes, but it's ignored.
An easy solution would be disabling the spoofing protection and using a mailbox with an "invalid" domain to send, but it will create a security problem where the user can send emails from any address.
Who will that Feature be useful to?
See the case described before.
What have you done already?
Implemented it.
Drawbacks of the implementation
I don't know if it's really a drawback, but I think it should be taken in consideration.
Non-delivery notifications (for example if the destination address doesn't exists) are delivered to the mailserver specified in the MX record of the domain.
Email aliases and dkim signature seems to not be applied to the mailserver generated notifications.