As long as you pull messages with IMAP or with POP with an additional 
setting on the client that says "leave a copy of message on the server", 
the messages should remain on the server.

On 5/22/2021 11:02 AM, Keith Smith via PLUG-discuss wrote:
> Hi,
>
> I'm reading the Ubuntu Server Guide and it talks about configuring 
> Postfix and Dovecot.  It mentioned a spam module for Dovecot that 
> appears to be an addon.
>
> I'm thinking I only need/want SMTP port 25 and IMAPS on port 993. I 
> want the email messages to remain on the server.
>
> Am I on the right track with Let's Encrypt, Postfix, and Dovecot, with 
> the mail messages remaining on the server, and SMTP port 25 and IMAPS 
> port 993?
>
> Thank You for all your help!!
> Keith
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