It sounds like the setting you're using for your outgoing SMTP server and/or IMAP server isn't quite right. Take a look at this setup example for tips on what you're doing wrong.
They show a line similar to yours as follows:
smtp-server=smtps.cs.utah.edu:587/tls/user=username/novalidate-cert
Also take a look at these setup configuration notes titled: Notes on Configuration and Preferences, specifically this section "Server Name Syntax". This section breaks down how the SMTP server configuration lines are constructed.
There's also this guide that might be marginally useful which shows how one would setup IMAP service for use with GMail, titled: How To Set Up Alpine With Gmail In Linux.
excerpt
IMAP
Now it's time to add Gmail accounts. Go to Main Menu => Setup =>
Collection List => Add, and fill the IMAP information like:
Nickname : my gmail account
Server : imap.gmail.com/ssl/[email protected]
Path :
View :
And in case the above weren't enough data points, here's one more that shows setting up Alpine for use with a Zimbra server, again using IMAP, titled: Configuring Alpine (or Pine) to read your mail.
excerpt
SMTP server
Using the arrow keys, move down to the “SMTP Server (for sending)”
line, and press “C” for “Change Val” (or you can just hit Return).
Type zimbra.ccs.neu.edu and hit Return, so that the line reads
SMTP Server (for sending) = zimbra.ccs.neu.edu
Inbox path (location of incoming mail)
Then move down to the “Inbox Path” line, and change that so it reads
Inbox Path = {zimbra.ccs.neu.edu:993/ssl/user=yourusername}INBOX
And then setup Alpine so that it can see your IMAP folders:
Nickname : Zimbra
Server : zimbra.ccs.neu.edu/ssl/user=jay
Path :
View :