Why am I getting multiple copies of an email?
You can change this behavior in the Configuration > Delivery > POP3Post Office Protocol 3 - A protocol used by local email clients to retrieve emails from mailboxes over a TCP/IP connection.
Download > (Select account) > Edit > Drop duplicate messages
option.
Discussion
If you use a single POP3 mailbox from your ISPInternet Service Provider - an organization that can provide Internet service. for all your users, then sort them into separate mailboxes at Kerio Connect, there are some limitations to be aware of.
If you select "Drop duplicate messages" in the POP3 Account settings, then mails to multiple users on the server will only be delivered to one recipient. Alternatively, if you do not select "Drop duplicate messages" then all recipients will receive a copy for each recipient specified.
If you switch to receiving mail directly with SMTPSimple Mail Transport Protocol - An internet standard used for email transmission across IP networks., you will not see this issue at all. Also, you could use ETRNExtended Turn is an extension to SMTP that enables you to forward messages to another SMTP server. to collect your mail, but this must be supported by your ISP.