What is "Sender Address Substitution" filter?
The Sender Address Substitution filter is a mail filter. It allows you to replace your message's
sender email address when you send the message via akapost.
When akapost receives a message and finds the sender address of the message matches your registered email address, akapost
will follow your Sender Address Substitution filter setting to substitute your actual email address with its associated
akapost or custom email address. Therefore your actual email address will not be disclosed to the recipient of your message.