qmail is a mail transfer agent for Unix/linux

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determine bounce-back/rfc status of email address without sending an email to that address

When you send an email that gets rejected by the server for some reason, you may get a bounce-back message with useful information about why the email was bounced, such as an RFC status code. Is there ...
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Qmailrocks installation error on CentOS 6.6

I've managed to install qmail-1.03 using the qmailrocks procedure on CentOS 6.6. When I telnet to port 25, I get an error in the qmail log below: [root@www qmail]# telnet domain.com 25 Trying ...
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qmail server, failure notices. Is the server compromised?

Ive hosted my own email for years now, and only recently have I started receiving failure notices that I have not sent. Below is an example of a header Hi. This is the qmail-send program at ...
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How to change the qmail hostname?

Is there a way to modify the hostname or, more precisely, remove the defaulthost from the address? When I'm sending mails issuing qmail-inject the recipient gets mails from an address like this: ...
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is there an iptables rule to allow only email on port 25?

Is there a way to block port 25 for everything but mail communication? Had no luck finding an answer to this yet. Maybe it's possible to block every application but those related to above usage? I am ...