added option to override SES port

README.md

@@ -31,6 +31,7 @@ You need to set the `GMAIL_USER` and `GMAIL_PASSWORD` to be able to use it.
 ### As Amazon SES Relay
 You need to set the `SES_USER` and `SES_PASSWORD` to be able to use it.<br/>
 You can override the SES region by setting `SES_REGION` as well.
+If you use Google Compute Engine you also should set `SES_PORT` to 2587.
 
 ### As generic SMTP Relay
 You can also use any generic SMTP server with authentication as smarthost.</br>

entrypoint.sh

@@ -42,7 +42,7 @@ if [ "$GMAIL_USER" -a "$GMAIL_PASSWORD" ]; then
 elif [ "$SES_USER" -a "$SES_PASSWORD" ]; then
 	opts+=(
 		dc_eximconfig_configtype 'smarthost'
-		dc_smarthost "email-smtp.${SES_REGION:=us-east-1}.amazonaws.com::587"
+		dc_smarthost "email-smtp.${SES_REGION:=us-east-1}.amazonaws.com::${SES_PORT=587}"
 	)
 	echo "*.amazonaws.com:$SES_USER:$SES_PASSWORD" > /etc/exim4/passwd.client
 # Allow to specify an arbitrary smarthost.