![Zimbra Mail Server](https://serverok.in/wp-content/uploads/2022/08/zimbra.webp)
How to block a domain in Zimbra
To block all emails from a specific domain in Zimbra, run the following commands as user zimbra (su – zimbra).
![Zimbra Mail Server](https://serverok.in/wp-content/uploads/2022/08/zimbra.webp)
How to disable Zimbra dnscache service
When you are using the Zimbra mail server behind NAT with Split DNS, you need to disable dnscache service. To
![Zimbra Mail Server](https://serverok.in/wp-content/uploads/2022/08/zimbra.webp)
How to Zimbra Split DNS with dnsmasq
When you install Zimbra on a server behind NAT, your public IP is not configured in the server, instead, it
![Ubuntu](https://serverok.in/wp-content/uploads/2022/03/ubuntu.webp)
Fake SMTP Server for testing
When you develop a website or an application, you may need to use a fake SMTP server for debugging. Fake
![](https://serverok.in/wp-content/uploads/2021/12/linux.webp)
How to configure Hostname in PowerMTA
By default, PowerMTA uses the server’s hostname. You can specify a custom hostname per Virtual MTA. To set a hostname
![](https://serverok.in/wp-content/uploads/2021/12/linux.webp)
iRedMail Intentional policy rejection
On an iRedMail, when receiving an email from steam, the mail server rejects the email with the error message “Recipient
![554 5.7.1 Unknown Sender in Local Domain](https://serverok.in/wp-content/themes/understrap-child/images/default.webp)
554 5.7.1 Unknown Sender in Local Domain
When sending an email from one server to another, the email gets bounced with an error SMTP error from remote
![](https://serverok.in/wp-content/uploads/2021/11/google-workspace.webp)
Google Workspace DKIM authentication settings failed.
When generating DKIM in google Google Workspace I got the following error message. DKIM authentication settings failed This error happens
![.forward file](https://serverok.in/wp-content/themes/understrap-child/images/default.webp)
.forward file
Users can create a .forward file in their home directories that is used by mail servers like exim, sendmail used
![postfix mail server](https://serverok.in/wp-content/uploads/2020/02/postfix-280x180.png)
postfix smtp Must issue a STARTTLS command first
When sending an email to a server, mail bounced with the following error message. Action: failed Status: 5.7.0 Remote-MTA: dns;
![Mailwizz](https://serverok.in/wp-content/themes/understrap-child/images/default.webp)
Mailwizz
Where MailWizz configuration file located?
![Where Mailwizz configuration file located?](https://serverok.in/wp-content/themes/understrap-child/images/default.webp)
Where Mailwizz configuration file located?
Mailwizz configuration file located at apps/common/config/main-custom.php When you migrate a MailWizz installation, you need to update this file and change