qmail is a mail transfer agent for Unix/linux

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Script won't run when uploaded (qmail)

I have qmail running on a remote server with a catch-all account that redirects to a script, and that script "does stuff," like filtering and sorting out. (No, it's not Bash) I don't remember how I ...
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OpenProject fails to send mails

I installed OpenProject following this guideline. After a day of work it runs. My current problem is, that sending of mails failed silently. I have only the following entry in my log: Started GET ...
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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 ...