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Tutorials Emails Server Setup Mail-Server Testing SMTP Tests

Topics

On this page

• Amazon AWS

  • Amazon ELB and multi-domain SAN/SSL Setup
  • Auto Scaling
  • Change Instance Type in AutoScaling

• Backup

  • Duplicity + Amazon S3

• Benchmark

  • apachebench
  • httperf
  • Siege

• CDN

  • Amazon Cloudfront CDN with W3 Total Cache WordPress
  • CDN.NET Configuration with W3 Total Cache Wordpress
  • CDN77 Configuration with W3 Total Cache WordPress

• Composer and WordPress

  • Getting Started
  • Git and File-System Layout (non-default setup)
  • Version Constraints
  • Managing Themes and Plugins (for entire WordPress site)
  • Updating Themes and Plugins (for entire WordPress site)
  • Adding Composer Support to Your Own Themes and Plugins (for developers)
  • Using Composer to Manage Own Theme/Plugin Dependencies (for developers)

• Docker and WordPress [WIP]

  • Kubernetes

    • WordPress with Kubernetes using Minikube and Helm on localhost (MacOS)

• Git

  • Git – Resolve Merge Conflicts
  • First time Git setup
  • Forking the Git
  • Mandatory stages in Git

• Gitlab

  • Gitlab-CE
  • gitlab-ci-multi-runner

• KVM

  • Convert qcow2 to raw format
  • Enable virtio for existing VM's

• Mac

  • Brew'ing PHP, MySQL & Nginx on Mac OS X

• Monitoring

  • Latest Monit setup on Ubuntu
  • NewRelic Setup for Ubuntu Server with PHP, FPM, Nginx and MySQL

• node.js

  • Installing ghost with nginx proxy-cache
  • Latest node.js & npm installation on Ubuntu 12.04

• Plesk

  • List Mailboxes Storage and Passwords

• Redis

• Standards

  • PHP

    • Code Sniffer

• Vagrant

• wpcli

  • Finding a faulty plugin
  • wp profile command

• Linux

  • Assigning Multiple IP Addresses to Single LAN Card
  • Disable IPv6 on Ubuntu 12.04
  • dsh – distributed shell
  • fdupes – find & replace duplicate files with hardlinks
  • GPG Keys Cheatsheet
  • Increase "Open Files Limit"
  • kill all php, nginx, mysql or any kind of processes
  • Passwordless Authentication for SSH
  • Screen
  • search replace in multiple files useing grep xargs sed
  • Setup sftp
  • sysctl.conf
  • Timezone Sync
  • Using Google Public DNS on Ubuntu Server
  • Using openssl to match private key, cerificate and CSR
  • Configure Postfix to Use Gmail SMTP on Ubuntu
  • Logrotate Example for Custom Logs
  • PHP 5.5, MySQL, Postfix, Nginx and WordPress on Ubuntu
  • Serverdensity
  • Upgrade Ubuntu 10.04 to 12.04
  • Using find and sed to replace strings in multiple files
  • Webmin

• Apache – Turn On/Off Directory Listing

• Enabling FastCGI on MediaTemple

• Manage SVN Users with htpasswd

• Mysql

  • .my.cnf – mysql user & password
  • Analyse slow-query-log using Anemometer
  • Improving MySQL Query Cache
  • MySQL Query Profiling
  • Reset MySQL root password
  • tuning-primer.sh – an alternative for mysqltuner
  • Using MariaDB 10
  • Install/Upgrade to MySQL 5.6 on Ubuntu 12.04 LTS
  • Change WordPress Domain Name
  • Character Sets and Collations
  • Enable innodb_file_per_table
  • Enable Remote Access (Grant)
  • Installing Percona Toolkit
  • Using tmpfs for temporary folder creation
  • YARPP and InnoDB
  • Convert MyISAM to InnoDB
  • Using tmpfs for mysqldump & mysqlimport
  • Convert from INNODB to MYISAM
  • Analyse slow-query-log using mysqldumpslow & pt-query-digest
  • mysqlcheck with cron to optimize automatically
  • Using MySQLTuner to Optimize MySQL configuration

• Emails

  • Checking FQDN, Reverse-DNS/PTR, MX record

  • Clients

    • Apple Mail
    • Mozilla Thunderbird

  • DKIM with Postfix

  • Postfix Queue Management

  • RoundCube

    • Forwarding all mails to other email id

  • Server Setup

    • Packages & Conventions

    • Postfix, Dovecot, ViMbAdmin, RoundCube

    • Amavis, Spamassassin & ClamAV Setup

    • Sieve Mail Filtering Setup

    • Mail-Server Testing

      • Antivirus Tests
      • IMAP Tests
      • POP Tests
      • SMTP Tests
      • Spam Tests

    • Mailserver Port Numbers

  • Setup OpenDKIM

  • SPF Records

  • swaks – SMTP test tool

  • Using larch for mail transfer between imap/gmail servers

  • Debugging Postfix Config, Mail Logs & more

  • Increasing Attachment Size in Posfix

• Nginx

  • Adding $upstream_cache_status in HTTP Response Headers

  • Amazon Elastic Load Balancer and Forwarding Real-IP Nginx

  • Block wp-login.php bruteforce attack

  • Configuring HTTP/2 Server Push

  • Enable gzip compression

  • fail2ban

  • Filter query string for Redis-Nginx cache

  • Let's Encrypt with EasyEngine

  • Nginx's Open file cache

  • Serving fonts with correct mime types

  • SSL – PCI compliance and performance optimization

  • Troubleshooting

    • Error: pcre_compile() failed: unrecognized character after
    • [emerg]: bind() to 0.0.0.0:80 failed (98: Address already in use)

  • Tweaking fastcgi-buffers

  • Using $upstream_cache_status in access.log

  • Using Pagespeed

  • Weak Diffie Hellman Logjam Attack Fix

  • Website access restriction using nginx

  • Enable Nginx Status Page

  • Forwarding Visitor's Real-IP + Nginx Proxy/Fastcgi backend correctly

  • Parsing access.log and error.logs using linux commands

  • Debugging Nginx Configuration

  • Nginx config for www to non-www and non-www to www redirection

  • Optimizing Nginx Configuration

  • Rewrite Rules for vBulletin SEO-friendly permalinks

• PHP

  • Directly connect to PHP-FPM
  • Generating core-dump for php5-fpm
  • GeoIP
  • Having php5 and php7 on same system.
  • Install Xdebug and configure it with webgrind
  • Installation of PHP Code Review Tools
  • memcache
  • PHP's Zend Opcache Config & Web Viewer
  • Setting Sqlite support with PHP
  • Using HHVM with PHP-FPM Fallback
  • Using Redis for PHP Sessions on Ubuntu Server
  • Installing PhpMyAdmin Quickly
  • Moving PHP's session storage to tmpfs
  • Install Xdebug and configure it with Netbeans
  • Nginx – Enable PHP-FPM Status Page
  • PHP-FPM: Socket vs TCP/IP and sysctl tweaking
  • APC Cache Optimization & Monitoring Using Web Interface
  • Checking if PHP/WordPress can send mails
  • Debugging PHP Scripts Using slow_log and more
  • Increase file upload size limit in PHP-Nginx
  • Increase PHP script execution time with Nginx

• ActiveCollab with Nginx + APC Cache

• WordPress

  • Performance Optimization
  • Remove Query string of css/js files
  • Setup ElasticSearch with ElasticPress
  • Using Redis for WordPress Object-Cache
  • WooCommerce Window Shopping Caching Technique
  • Moving WordPress To New Server (Faster)
  • Better wp-cron using linux's crontab
  • 404 error- Page not Found!!!
  • Debugging WordPress with Nginx

Connect to server

Authentication

SMTP Commands to send test email

Open-Relay Test

swaks utility

SMTP Tests

Connect to server

For non-secure SMTP, you can use

			telnet example.com 25
		

For secure SMTP, you can use one of following:

			openssl s_client -starttls smtp -connect example.com:25
openssl s_client -starttls smtp -connect example.com:465
openssl s_client -starttls smtp -connect example.com:587
		

As soon as you connect to the server, run:

			ehlo example.com
		

You will get output like below as reply:

			250-test.rtcamp.com
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-STARTTLS
250-AUTH PLAIN LOGIN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
		

If you do not see line like 250-AUTH ... line, then your server may not support authentication. Most likely you will see this when trying with telnet or openssl without startls.

Authentication

For admin@example.com and password, generate base64 encoded string like below:

			echo -ne '\0admin@example.com\0password' | base64
		

Please note use of \0 before username and password. It must be used as it is. Also, use single-quotes to avoid escaping special characters in your password.

It will output a string like below:

			AGFkbWluQGV4YW1wbGUuY29tAHBhc3N3b3Jk
		

Use above string with AUTH command:

			AUTH PLAIN AGFkbWluQGV4YW1wbGUuY29tAHBhc3N3b3Jk
		

SMTP Commands to send test email

Type/paste following commands 1-by-1. They are interactive and needs input.

			ehlo example.com
mail from: admin@example.com
rcpt to: admin@other.com
data
quit
		

For more SMTP Tests, check this.

Open-Relay Test

Worst thing that could happen to your SMTP server is – it becomes open-relay (accidentally). An open-relay allows anybody to connect and send email using your server. It can lead to your server being blacklisted. I am not sure if it can result in legal hassles!

There are many tools available online which can check if your smtp server is acting as open relay.

swaks utility

This is a small package which can make it easy to test your smtp server.

			apt-get install swaks
		

Example usage:

			swaks --server example.com --to admin@example.com
		

Please note that spamassassin marks, swaks generated email as spam.

POP Tests

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Spam Tests

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