RT @LastQuake: Until a method is scientifically proven, we will maintain our policy: we refuse our timeline to be associated with predictio… 1 hour ago
RT @LastQuake: Earthquakes may happen anytime: what to do during the shaking?
🠪 INSIDE: take shelter, keep away from windows.
🠪 OUTSIDE: st… 1 hour ago
Free tool that discovers security configuration errors in SSH and TLS servers and explains how to fix them. Supports STARTTLS and can also scan HTTPS, POP3, IMAP and SMTP servers.
It gives you a list of servers a target domain uses (for purposes like web, email, etc) that can have external encryption enabled, then allows you to test these.
The list by default has only servers within that target domain enabled, but you can optionally include other servers (for instance if a domain uses a third party for their SMTP handling).
IANA has reassigned anew service to this port, and it should no longer be used for SMTP communications.
However, because it was once recognized by IANA as valid, there may be legacy systems that are only capable of using this connection method. Typically, you will use this port only if your application demands it. A quick Google search, and you’ll find many consumer Inbox Service Providers’ (ISPs) articles that suggest port 465 as the recommended setup. However, we do not recommend it, as it is not RFC compliant.
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Ralf Hildebrandt is an active and well-known figure in the Postfix community. He’s a systems engineer for T-NetPro, a German telecommunications company and has spoken about Postfix at industry conferences and contributes regularly to a number of open source mailing lists.
Best practices for Postfix–the popular alternative to Sendmail. Developed with security and speed in mind, Postfix has become a popular alternative to Sendmail and comes preinstalled in many Linux distributions as the default mailer. The Book of Postfix is a complete guide to Postfix whether used at home, as a mailrelay or virus-scanning gateway, or as a company mailserver. Practical examples show how to deal with daily challenges like protecting mail users from spam and viruses, managing multiple domains, and offering roaming access.
The purpose of Two-Step Verification (2SV) is to protect you from bad actors logging into your Ring account, even if those bad actors have the proper login credentials. This feature will be enabled by default for all users and, unlike 2FA, there is no user option to opt out.
Convert the CIDR notation to individual IP addresses (as sendmail cannot handle CIDR),
This uses a combination of xargs with the sh trick to split the CIDR list into separate arguments, and prips (which prints the IP addresses for a CIDR); see: