diff --git a/docker-compose.yml b/docker-compose.yml
index 2649ec3..494670d 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -19,6 +19,7 @@ services:
           - INSTALL_BLACKFIRE=${INSTALL_BLACKFIRE}
           - INSTALL_SOAP=${WORKSPACE_INSTALL_SOAP}
           - INSTALL_LDAP=${WORKSPACE_INSTALL_LDAP}
+          - INSTALL_IMAP=${WORKSPACE_INSTALL_IMAP}
           - INSTALL_MONGO=${WORKSPACE_INSTALL_MONGO}
           - INSTALL_PHPREDIS=${WORKSPACE_INSTALL_PHPREDIS}
           - INSTALL_MSSQL=${WORKSPACE_INSTALL_MSSQL}
diff --git a/env-example b/env-example
index 95d5e25..5d082ab 100644
--- a/env-example
+++ b/env-example
@@ -32,6 +32,7 @@ PHP_INTERPRETER=php-fpm
 WORKSPACE_INSTALL_XDEBUG=false
 WORKSPACE_INSTALL_LDAP=false
 WORKSPACE_INSTALL_SOAP=false
+WORKSPACE_INSTALL_IMAP=false
 WORKSPACE_INSTALL_MONGO=false
 WORKSPACE_INSTALL_PHPREDIS=false
 WORKSPACE_INSTALL_MSSQL=false
diff --git a/workspace/Dockerfile-56 b/workspace/Dockerfile-56
index 6651022..76fbe2c 100644
--- a/workspace/Dockerfile-56
+++ b/workspace/Dockerfile-56
@@ -69,6 +69,21 @@ RUN if [ ${INSTALL_SOAP} = true ]; then \
   apt-get -y install libxml2-dev php5.6-soap \
 ;fi
 
+#####################################
+# IMAP:
+#####################################
+USER root
+
+ARG INSTALL_IMAP=false
+ENV INSTALL_IMAP ${INSTALL_IMAP}
+
+RUN if [ ${INSTALL_IMAP} = true ]; then \
+  # Install the PHP IMAP extension
+  add-apt-repository -y ppa:ondrej/php && \
+  apt-get update -yqq && \
+  apt-get -y install php5.6-imap \
+;fi
+
 #####################################
 # Set Timezone
 #####################################
diff --git a/workspace/Dockerfile-70 b/workspace/Dockerfile-70
index b475a79..06421db 100644
--- a/workspace/Dockerfile-70
+++ b/workspace/Dockerfile-70
@@ -82,6 +82,18 @@ RUN if [ ${INSTALL_LDAP} = true ]; then \
     apt-get install -y php7.0-ldap \
 ;fi
 
+#####################################
+# IMAP:
+#####################################
+
+ARG INSTALL_IMAP=false
+ENV INSTALL_IMAP ${INSTALL_IMAP}
+
+RUN if [ ${INSTALL_IMAP} = true ]; then \
+    apt-get update -yqq && \
+    apt-get install -y php7.0-imap \
+;fi
+
 #####################################
 # Set Timezone
 #####################################
diff --git a/workspace/Dockerfile-71 b/workspace/Dockerfile-71
index eedb8f2..6fe5991 100644
--- a/workspace/Dockerfile-71
+++ b/workspace/Dockerfile-71
@@ -82,6 +82,18 @@ RUN if [ ${INSTALL_LDAP} = true ]; then \
     apt-get install -y php7.1-ldap \
 ;fi
 
+#####################################
+# IMAP:
+#####################################
+
+ARG INSTALL_IMAP=false
+ENV INSTALL_IMAP ${INSTALL_IMAP}
+
+RUN if [ ${INSTALL_IMAP} = true ]; then \
+    apt-get update -yqq && \
+    apt-get install -y php7.1-imap \
+;fi
+
 #####################################
 # Set Timezone
 #####################################