remove outdated sSMTP; update readme

README.MD

@@ -192,14 +192,41 @@ make docker push
 
 ## Sending emails
 
-Docker containers do not have a custom SMTP server. We use an SMTP relay service. You can set up an SMTP server
-like Gmail, AWS, Sendinblue, Mailgun, etc, or use another server you like.
+Mail is not routed by the Docker containers, you must use an SMTP external service to route your site's email.
 
-Just edit sSMTP config block in your `.env.secret` file.
+The reason that mail is not routed is that configuring mail to route from the proper domain on a server is often a headache. A further headache is actually getting mail delivered from an arbitrary IP. A third issue is that mail servers consume resources. A fourth issue is security. So for all these reasons we decided not to implement mail and instead delegate that task to various providers.
 
-sSMTP config files `./docker/wordpress/config/ssmtp.conf.template` and `./docker/wordpress/config/revaliases.template` automatically loaded into the WordPress container
+You can set up an SMTP service like Gmail, AWS SES, Sendinblue, Mailgun, etc., or use another server you like.
+
+Just edit SMTP config block in your `.env.main` and `.env.secret` files.
+
+`.env.main`:
+```bash
+# SMTP config
+SMTP_HOST=smtp.gmail.com
+SMTP_PORT=587
+
+# none|ssl|tls
+SMTP_SECURE=tls
+SMTP_DEBUG=0
+```
+
+`.env.secret`:
+```bash
+SMTP_USER=your_smtp_service_user_name
+SMTP_PASS=your_smtp_service_user_password
+```
+
+Also, to debug Emails on local you can use [MailHog](https://github.com/mailhog/MailHog) service. Just run:
+
+```bash
+make mailhog
+```
+
+`.env.type.local` file already has mailhog connection settings.
+
+This will run MailHog container, and you can access it on `your-app-domain.com:8025` URL.
 
-See [an example](https://www.wordpressdocker.com/mailgun-ssmtp/) of ssmtp.conf
 
 ## Database management
 ### SSH tunnel options

config/php/php.ini

@@ -1106,7 +1106,7 @@ pdo_mysql.default_socket=
 
 ; For Unix only.  You may supply arguments as well (default: "sendmail -t -i").
 ; https://php.net/sendmail-path
-sendmail_path = /usr/sbin/ssmtp -t -i
+;sendmail_path =
 
 ; Force the addition of the specified parameters to be passed as extra parameters
 ; to the sendmail binary. These parameters will always replace the value of

docker-compose.build.yml

@@ -21,8 +21,6 @@ services:
       - ./logs/wordpress:/var/log/wordpress
       # PHP ini config
       - ./config/php:/usr/local/etc/php
-      # SSMTP config
-      - ./config/ssmtp:/etc/ssmtp/templates:ro
       # Share shell scripts
       - ./sh:/shell:ro
 

docker-compose.yml

@@ -36,8 +36,6 @@ services:
       - ./logs/wordpress:/var/log/wordpress
       # PHP ini config
       - ./config/php:/usr/local/etc/php
-      # SSMTP config
-      - ./config/ssmtp:/etc/ssmtp/templates:ro
       # Share shell scripts
       - ./sh:/shell:ro
 

dockerfiles/php/Dockerfile

@@ -19,8 +19,6 @@ RUN set -eux; \
       ghostscript \
 # Alpine package for "imagemagick" contains ~120 .so files, see: https://github.com/docker-library/wordpress/pull/497
       imagemagick \
-# Use SMTP relay service
-      ssmtp \
 # Envsubst for operate with env variables in config files
       gettext \
 # Install wp-cli dependencies