I Installed squirrel mail on along with ispconfig 3on my VPS. I was able to set up squirrelmail with no issues and sent a test email to a few accounts. It says sent but the receiver doesn't get the mail the same is for reverse. I tried mail forwarding and that works. As in I would set it so that if my squirrel mailbox got a message it would forward it to a secondary email. I still would like the original mailbox to work how do I address this issue?