WSO2 ESB MailTransportListener not receiving - wso2

Question

I just installed my brand new WSO2 ESB 4.9.0. This is the latest version which I downloaded yesterday.
I am trying to get my ESB to receive e-mail from a server. I have tried POP3 and IMAP. I have been using several references to help me(Since I am a new member, my reputation does not yet allow me to post proper links to all my references):
stackoverflow.com/questions/27376833/wso2-mailto-transport-emptied-my-inbox
javamail.java.net/nonav/docs/api/com/sun/mail/pop3/package-summary.html
javamail.java.net/nonav/docs/api/com/sun/mail/imap/package-summary.html
sparkletechthoughts.blogspot.fr/2013/10/how-to-receive-emails-to-wso2-esb.html
charithaka.blogspot.com/2012/11/how-to-enable-mail-transport-for-wso2.html
irhamiqbal.wordpress.com/how-to-receive-email-using-wso2-esb/
jayalalk.blogspot.com/2014/06/wso2-esb-mail-sending-with-html-complex.html
And of course the official documentation:
https://docs.wso2.com/display/ESB481/MailTo+Transport
https://docs.wso2.com/display/AS501/Using+Mail+transport+to+Invoke+Web+Services
All of my reading leads me to believe that I have everything set up properly (or if not properly, good enough to get some error messages to troubleshoot).
I did restart the WSO2 ESB and the following message shows up in the console log:
TID[-1234] [ESB] [2016-08-02 21:45:37,237] INFO {org.apache.axis2.transport.mail.MailTransportListener} - MAILTO listener started
I get no other indication in the logs one way or another.
I edited (and double checked) my $CARBON_HOME/repository/conf/axis2/axis2.xml, and I'm pretty sure I have the mail transport enabled properly:
<transportReceiver name="mailto" class="org.apache.axis2.transport.mail.MailTransportListener">
<!-- configure any optional POP3/IMAP properties
check com.sun.mail.pop3 and com.sun.mail.imap package documentation for more details-->
</transportReceiver>
<transportSender name="mailto" class="org.apache.axis2.transport.mail.MailTransportSender">
<parameter name="mail.smtp.host">my.smtp.server</parameter>
<parameter name="mail.smtp.port">587</parameter>
<parameter name="mail.smtp.starttls.enable">false</parameter>
<parameter name="mail.smtp.auth">true</parameter>
<parameter name="mail.smtp.user">my#user.id</parameter>
<parameter name="mail.smtp.password">password</parameter>
<parameter name="mail.smtp.from">my#email.com</parameter>
</transportSender>
And, finally, I have my Proxy Service setup (in its current iteration, anyway):
<?xml version="1.0" encoding="UTF-8"?>
<proxy xmlns="http://ws.apache.org/ns/synapse"
name="JasperEmailPOP3"
transports="mailto"
statistics="disable"
trace="disable"
startOnLoad="true">
<target>
<inSequence>
<property name="senderAddress"
expression="get-property('transport', 'From')"
scope="default"
type="STRING"/>
<log level="custom">
<property name="Date" expression="$trp:Date"/>
<property name="Subject" expression="$trp:Subject"/>
<property name="Content-Type" expression="$trp:Content-Type"/>
<property name="From" expression="$trp:From"/>
</log>
<drop/>
</inSequence>
<outSequence>
<send/>
</outSequence>
</target>
<parameter name="mail.pop3.socketFactory.class">javax.net.ssl.SSLSocketFactory</parameter>
<parameter name="transport.PollInterval">5</parameter>
<parameter name="mail.pop3.host">my.pop3.email</parameter>
<parameter name="mail.pop3.user">my#email.com</parameter>
<parameter name="transport.mail.Protocol">pop3</parameter>
<parameter name="mail.pop3.socketFactory.port">995</parameter>
<parameter name="transport.mail.Address">jasper#eryjus.com</parameter>
<parameter name="mail.pop3.password">password</parameter>
<parameter name="mail.pop3.port">995</parameter>
<parameter name="mail.pop3.socketFactory.fallback">false</parameter>
<description/>
</proxy>
With all of this, my question is: is there something else I am missing to get the ESB to at least attempt to retrieve e-mail? What bothers me is I am not getting any error messages to troubleshoot (such as my mail not being in plain test).

Answer 1

I tried the same scenario with a Gmail account and it works fine for me, seems like some mis-configuration in your POP server. You need to add following property as well.
<parameter name="transport.mail.ContentType">text/plain</parameter>
See the full proxy configs below.
<?xml version="1.0" encoding="UTF-8"?>
<proxy xmlns="http://ws.apache.org/ns/synapse"
name="JasperEmailPOP3"
transports="mailto"
statistics="disable"
trace="disable"
startOnLoad="true">
<target>
<inSequence>
<property name="senderAddress"
expression="get-property('transport', 'From')"
scope="default"
type="STRING"/>
<log level="custom">
<property name="Date" expression="$trp:Date"/>
<property name="Subject" expression="$trp:Subject"/>
<property name="Content-Type" expression="$trp:Content-Type"/>
<property name="From" expression="$trp:From"/>
</log>
<drop/>
</inSequence>
<outSequence>
<send/>
</outSequence>
</target>
<parameter name="mail.pop3.socketFactory.class">javax.net.ssl.SSLSocketFactory</parameter>
<parameter name="transport.PollInterval">5</parameter>
<parameter name="mail.pop3.host">pop.gmail.com</parameter>
<parameter name="mail.pop3.user">ycwso2test</parameter>
<parameter name="transport.mail.Protocol">pop3</parameter>
<parameter name="mail.pop3.socketFactory.port">995</parameter>
<parameter name="transport.mail.Address">ycwso2test#gmail.com</parameter>
<parameter name="mail.pop3.password">wso2qa123</parameter>
<parameter name="mail.pop3.port">995</parameter>
<parameter name="mail.pop3.socketFactory.fallback">false</parameter>
<parameter name="transport.mail.ContentType">text/plain</parameter>
<description/>
</proxy>
Also if you need to further debug this you can enable DEBUG logs. To do this add the following line to repository/conf/log4j.properties and restart.
log4j.logger.org.apache.axis2.transport.mail.MailTransportListener=DEBUG