Location and overview of mail client settings can be found below. The server settings being the same regardless of what mail client or device is being set up. Note that port settings may need to be adjusted depending on local network or ISP restrictions.
The mail server for a site can be found at Winhost Control Panel > Sites > the domain name > in the "Site Info" pane as in the image below.
Replacing "xx" with the mail server for the site, the connection settings are
incoming mail server: mxx.internetmailserver.net
outgoing mail server: mxx.internetmailserver.net
password: email account password
And SMTP authentication will need to be enabled in the client to send mail.
General Port Information
The port used depends on encryption settings and possible local network restrictions. Note that depending on the mail client there may be separate options for "STARTTLS" and "SSL / TLS". Information can be found on the difference between "STARTTLS" and "TLS", but generally the "STARTTLS" setting should be tested first before "SSL / TLS". Both "STARTTLS" and "TLS" using the same TLS ports below. TLS also being the newer encryption protocol, so it is best to try it before SSL. Though SSL can be used in cases of older clients / devices that do not support TLS 1.2 or have port restrictions.
POP TLS: 110
POP SSL: 995
POP (unencrypted): 110
IMAP TLS: 143
IMAP SSL: 993
IMAP (unencrypted): 143
SMTP TLS: 25 or 587
SMTP SSL: 465
SMTP (unencrypted): 25 or 587