diff --git a/src/main/docker/app.yml b/src/main/docker/app.yml
index 7dd793e..99ecb78 100644
--- a/src/main/docker/app.yml
+++ b/src/main/docker/app.yml
@@ -47,7 +47,6 @@ services:
     command: bin/maildev --base-pathname /maildev -w 1080 -s 25
     ports:
       - 1080
-      - 25
 
   minio:
     image: quay.io/minio/minio
@@ -62,3 +61,9 @@ services:
       - 9010:9000
       - 9090:9090
     command: server /data --console-address ":9090"
+  mail:
+    image: barais/smtprelay
+    restart: always
+    volumes:
+      -  ./exampleconf/smtprelay.ini:/app/smtprelay.ini:ro
+      -  ./tmp:/tmp:rw
diff --git a/src/main/docker/exampleconf/smtprelay.ini b/src/main/docker/exampleconf/smtprelay.ini
new file mode 100644
index 0000000..f92b634
--- /dev/null
+++ b/src/main/docker/exampleconf/smtprelay.ini
@@ -0,0 +1,130 @@
+; smtprelay configuration
+;
+; All config parameters can also be provided as environment
+; variables in uppercase and the prefix "SMTPRELAY_".
+; (eg. SMTPRELAY_LOGFILE, SMTPRELAY_LOG_FORMAT)
+
+; Logfile (blank/default is stderr)
+;logfile =
+
+; Log format: default, plain (no timestamp), json
+log_format = default
+
+; Log level: panic, fatal, error, warn, info, debug, trace
+log_level = info
+
+; Hostname for this SMTP server
+hostname = localhost.localdomain
+
+; Welcome message for clients
+;welcome_msg = <hostname> ESMTP ready.
+
+; Listen on the following addresses for incoming
+; unencrypted connections.
+listen = 127.0.0.1:1025
+
+; STARTTLS and TLS are also supported but need a
+; SSL certificate and key.
+;listen = tls://127.0.0.1:465 tls://[::1]:465
+;listen = starttls://127.0.0.1:587 starttls://[::1]:587
+;local_cert = smtpd.pem
+;local_key  = smtpd.key
+
+; Enforce encrypted connection on STARTTLS ports before
+; accepting mails from client.
+;local_forcetls = false
+
+; Only use remotes where FROM EMail address in received
+; EMail matches remote_sender.
+;strict_sender = false
+; Socket timeout for read operations
+; Duration string as sequence of decimal numbers,
+; each with optional fraction and a unit suffix.
+; Valid time units are "ns", "us", "ms", "s", "m", "h".
+;read_timeout = 60s
+
+; Socket timeout for write operations
+; Duration string as sequence of decimal numbers,
+; each with optional fraction and a unit suffix.
+; Valid time units are "ns", "us", "ms", "s", "m", "h".
+;write_timeout = 60s
+
+; Socket timeout for DATA command
+; Duration string as sequence of decimal numbers,
+; each with optional fraction and a unit suffix.
+; Valid time units are "ns", "us", "ms", "s", "m", "h".
+;data_timeout = 5m
+
+; Max concurrent connections, use -1 to disable
+;max_connections = 100
+
+; Max message size in bytes
+;max_message_size = 10240000
+
+; Max RCPT TO calls for each envelope
+;max_recipients = 100
+
+; Networks that are allowed to send mails to us
+; Defaults to localhost. If set to "", then any address is allowed.
+;allowed_nets = 127.0.0.0/8 ::1/128
+allowed_nets =
+; Regular expression for valid FROM EMail addresses
+; If set to "", then any sender is permitted.
+; Example: ^(.*)@localhost.localdomain$
+;allowed_sender =
+
+; Regular expression for valid TO EMail addresses
+; If set to "", then any recipient is permitted.
+; Example: ^(.*)@localhost.localdomain$
+;allowed_recipients =
+
+; File which contains username and password used for
+; authentication before they can send mail.
+; File format: username bcrypt-hash [email[,email[,...]]]
+;   username: The SMTP auth username
+;   bcrypt-hash: The bcrypt hash of the pasword (generate with "./hasher password")
+;   email: Comma-separated list of allowed "from" addresses:
+;          - If omitted, user can send from any address
+;          - If @domain.com is given, user can send from any address @domain.com
+;          - Otherwise, email address must match exactly (case-insensitive)
+;          E.g. "app@example.com,@appsrv.example.com"
+;allowed_users =
+
+; Relay all mails to this SMTP servers.
+; If not set, mails are discarded.
+;
+; Format:
+;   protocol://[user[:password]@][netloc][:port][/remote_sender][?param1=value1&...]
+;
+;   protocol: smtp (unencrypted), smtps (TLS), starttls (STARTTLS)
+;   user: Username for authentication
+;   password: Password for authentication
+;   remote_sender: Email address to use as FROM
+;   params:
+;     skipVerify: "true" or empty to prevent ssl verification of remote server's certificate
+;     auth: "login" to use LOGIN authentication
+
+; GMail
+;remotes = starttls://user:pass@smtp.gmail.com:587
+
+; Mailgun.org
+;remotes = starttls://user:pass@smtp.mailgun.org:587
+
+; Mailjet.com
+;remotes = starttls://user:pass@in-v3.mailjet.com:587
+
+; Ignore remote host certificates
+;remotes = starttls://user:pass@server:587?skipVerify
+
+; Login Authentication method on outgoing SMTP server
+;remotes = smtp://user:pass@server:2525?auth=login
+
+; Sender e-mail address on outgoing SMTP server
+;remotes = smtp://user:pass@server:2525/overridden@email.com?auth=login
+
+; Multiple remotes, space delimited
+remotes = smtp://maildev:25?rate=300/1m
+; remotes = smtp://127.0.0.1:2525?rate=1/1m
+
+; Pipe messages to external command
+;command = /usr/local/bin/script