Have you upgraded any of your Debian systems to Jessie yet?
No? Then read on so that you can avoid some of the possible pitfalls that come with this upgrade. Continue reading Upgrading Debian Guests on Proxmox to Jessie
If you are reading this you are probably making my life harder
E-Mail sucks! Your users just keep clicking the links in those damn phishing mails. And you can’t do anything about it. Hell somebody might be sending spam in your name and you have no idea about it. Let me blow your mind: You can solve these problems, for free. And I will introduce you the tools you need.
The cure to your E-Mail headaches hides behind three small acronyms:
- SPF: Sender Policy framework, tells others which mail servers are authorized to send E-Mail for your domain.
- DKIM: Domain Keys Identified Mail, uses encryption and DNS to verify an E-Mail sender and that it was not altered in transit
- DMARC: Domain based Message Authentication, Reporting and Conformance. Builds on SPF and DKIM and implements a policy and reporting system around them
Continue reading How to eliminate spam and protect your name with DMARC
One of our customers needed a way to use multiple mail domains. He already had a SBS2011, The Exchange Server on it was configured for the primary E-Mail Domain of the Company. The E-Mails from this Domain were fetched with the POP3 connector and all outgoing Mail was sent to the smart host of the E-Mail Provider.
The additional E-Mail Domains required a similar setup.
Unfortunately Exchange does not allow you to change the smart host for outgoing E-Mail based on the sender. There are third party Exchange addons, that do provide this ability, but I preferred to solve the problem with a Linux Mail Server. The configuration I will describe to you is fairly basic and the scenario it is used in is somewhat special. But the Article will still give you a fairly good impression on how to get a basic Mail Server running and how all the different pieces work together.
Continue reading Debian Wheezy E-Mail Relay for multiple Domains and IMAP Server with Postfix Dovecot and Fetchmail