List messages in the INBOX over IMAP(S):
curl -k -v --url 'imaps://mail.example.com:993' --user 'admin@example.com:setup' --request "EXAMINE INBOX"
Send a message over SMTP+STARTTLS:
curl -k -v --url 'smtp://mail.example.com:25' --user 'admin@example.com:setup' --ssl-reqd --mail-from 'admin@example.com' --mail-rcpt 'admin@example.org' --upload-file message
Here virtual is the name of the virtual.db
postmap -s /var/spool/postfix/plesk/virtual
plesk db "SELECT d.name AS 'Subscription', IF (p.value = 'true', 'Enabled', 'Disabled') AS 'DKIM Status' FROM domains d LEFT JOIN DomainServices ds ON d.id = ds.dom_id LEFT JOIN (SELECT * FROM Parameters WHERE parameter = 'domain_keys_sign') p ON ds.parameters_id = p.id WHERE ds.type = 'mail';"
plesk sbin mail_auth_view