How to Relay Mail from TWC Home Connections | If you are like me, you have some Linux machines at home or a workstation which would benefit from relaying mail out for logwatch, owncloud emails, cron errors, or other reasons like perhaps a home mail server. If using Time Warner this is how to relay mail from home without being dropped or marked as spam!
Beware of Scam Emails about China Domain Name Registration Service | If you get an email from a random Chinese company asking for authorization about registering a similar domain name as yours, it’s a scam. They are simply waiting for you to respond and then will attempt to force you to register domains with them. The best thing is to just ignore and delete any such emails!
How to Fetch DKIM Records from DNS | DKIM is simply a TXT record in DNS. A simple host command can fetch this record. I’ll show you how! The command is: $ host -t TXT dkimrecord So how do you find that dkim value? DKIM records are in the following format: [selector]._domainkey.[domain] The selector and domain are provided in the email headers of
How to Check Mail Server for SMTP Over TLS | Q. How can I check a server for SMTP over TLS? It is possible to have an SMTP connection use TLS from the sending server to the receiving server to add a pinch of security. Many banks and other security-minded corporations require this to send and receive email. To check the TLS capability of an
Open and Extract winmail.dat Files | How can I open winmail.dat or other .dat files? Outlook users sending HTML emails with attachments often reach other users as an odd winmail.dat file. (Thanks, Microsoft!) I’ll show you some tips on how to open that attachment! The perhaps easiest way to extract or view these sort of attachments is via the excellent website:
Prevent Postfix Brute Force | An often used attack vector is brute forcing MTA logins. While most admins watch ssh auth logs like a hawk, email auth/login logs are most often not closely watched for this sort of thing if at all. I’ll show you one way to easily prevent a Postfix brute force attack! This how-to focuses on fail2ban