Topic: Mail rejected when remote sender is also a local mailbox
==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail 1.3.2
iRedAdmin-Pro 4.7 (MySQL)
- Deployed with the downloadable installer?
- Linux/BSD distribution Ubuntu - 20.04
- Store mail accounts in which backend (/MySQL/L):
- Web server (Nginx):
- Manage mail accounts with iRedAdmin-Pro? YES
I have a domain on my iRedMail server ( Example.com) and a user email@example.com
I also have a domain bigOrganisation.com and website@bigOrganisation.com
I have set up MailGun to deliver emails on behalf of bigOrganisation.com website. (IRedMail kept throttling senders even with it turned off)
When the website ( bigOrganisation.com ) sends an email to firstname.lastname@example.org, via mail gun, the MX record points to my mail server. The email is sent as
My mail server rejects the email with Sender address rejected: User unknown
Now if wordpress@bigOrganisation.com was an external mail sender, with no account on my server, it would get through okay.
How do we get this email accepted?
----Spider Email Archiver: On-Premises, lightweight email archiving software developed by iRedMail team.