Dmitry Razumikhin dmitry-ra

An ultimate guide to Postfix + Dovecot IMAP server with complete SPF, DKIM and DMARC support and additional instructions for a multi-domain setup

In this guide, domain.com will be your root domain and mail.domain.com will be the hostname of your mail server

An ultimate guide to Postfix + Dovecot IMAP server with complete SPF, DKIM and DMARC support and additional instructions for a multi-domain setup
0x05 Install and configure Postfix

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  artifacts/
  build/
  docs/
  lib/
  packages/
  samples/
  src/
 tests/

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

	using HtmlAgilityPack;
	using System;
	using System.Collections.Generic;
	using System.IO;
	using System.Linq;
	using System.Net;
	using System.Xml.Linq;
	using System.Xml.XPath;

	// generated page is hosted at https://drachev.com/officedaytime/

	Как настроить SSH на сервере для увеличения времени сессий

	Для устранения рассоединения при отсутствии активности в шелле необходимо настроить SHH сервис на стороне сервера.

	Для этого нужно отредактировать файл «/etc/ssh/sshd_config».

	Имя фала и его раположение одинаково как во FreeBSD, так и в CentOS.

	Далее нам необходимо отредактировать три параметра:

	Hello there! You are currently visiting gopherspace through a
	proxy. To learn more about gopher and how to browse it, read this.
	______________________________________________________________________

	###################################################################
	Writing C software without the standard library
	Linux Edition
	###################################################################
	There are many tutorials on the web that explain how to build a
	simple hello world in C without the libc on AMD64, but most of them

	# copied from http://gbayer.com/development/moving-files-from-one-git-repository-to-another-preserving-history/
	git clone <git repository A url> # clone source repository
	cd <git repository A directory>
	git remote rm origin # to make sure it doesn't affect the original repository
	git filter-branch --subdirectory-filter <directory 1> -- --all # remove all files other than the ones needed
	mkdir <directory 1> # move them into another directory where they will be stored in the destination repository (if needed)
	mv * <directory 1>
	git add .
	git commit

	// Params:
	// 1. query (filter) if you only want to remove this field from some records. {} will select any.
	// 2. $unset the field(s) that you want to remove. Here I've set them to null but the value doesn't matter as it's ignored.
	// 3. multi must be set to true otherwise it will only operate on the first record that it finds.
	//
	// Run this command in the MongoDB shell

	db.<collectionName>.update( {}, {$unset: {<fieldName1>: null, <fieldName2>: null}}, {multi: true});

	#include <iostream>

	template <typename T>
	class range {
	private:
	class iter {
	private:
	T m_x;

	public:

	$wc=new-object net.webclient
	$wp=[system.net.WebProxy]::GetDefaultProxy()
	$wp.UseDefaultCredentials=$true
	$wc.Proxy=$wp
	iex ($wc.DownloadString('https://chocolatey.org/install.ps1'))