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Tutorials Emails Increasing Attachment Size in Posfix

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• 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

Note:

Increasing Attachment Size in Posfix

Postfix by default restrict attachment size to approx 10MB i.e. 10240000 bytes.

You can check it using following command:

			postconf | grep message_size_limit
		

To change attachment-size to say 50 MB, run a command like:

			postconf -e message_size_limit=52428800
		

Note:

If you are running a mail-server with SMTP/IMAP access, you need to change postfix attachment size only. I spent half-hour debugging dovecot to increase attachment size, just to realize that above change in postfix config was all I needed!

Debugging Postfix Config, Mail Logs & more

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