I've found the solution you nead to specify those properties
<activation-config-property>
<activation-config-property-name>storeProtocol</activation-config-property-name>
<activation-config-property-value>pop3s</activation-config-property-value>
</activation-config-property>
<activation-config-property>
<activation-config-property-name>port</activation-config-property-name>
<activation-config-property-value>995</activation-config-property-value>
</activation-config-property>
<activation-config-property>
<activation-config-property-name>starttls</activation-config-property-name>
<activation-config-property-value>true</activation-config-property-value>
</activation-config-property>
be careful especiali for the protocol which is POP3S and not POP3