Hi,Here is our osTicket info:osTicket Versionv1.9.12 (19292ad)  Upgrade— v1.9.14 is availableWeb Server SoftwareApacheMySQL Version5.5.42PHP Version5.6.17When an agent adds a message, our customers are not always receiving the email response.  Some customers do, and some do not.  Trying to track down the issue.We checked the mail logs, and the ones that do not get received, are not showing up in the mail logs.  The ones that do get recevied, do show up in the logs.  This implies an issue in osTicket not being able to send the email properly.....Right now we have email all using PHP Mail functions as we have never been able to get SMTP to configure properly for our email address.  The problem seems to be getting worse lately.  When I use the Diagnostics for email, our tests all work fine.I wanted to try to set up using SMTP directly in osTicket, but am not able to.We use Bluehost, and have 2 smtp ports.  26 non-secured, and 465, SSL.When I try 26, I get the following:authentication failure When I try 465, osTicket just hangs and nothing happens.Incoming emails (we use fetch) all work,and the IMAP and SMTP user/pwd are the same, so that is correct.Any ideas how to resolve the SMTP issue?And, where can I track down mail errors from the PHP functions since it appears some are not getting sent.Thanks for any help and advice,Mark