- Plesk Onyx 17.5 for Linux
Mail Server Settings menu is absent in Tools & Settings .
No SMTP and IMAP/POP3 servers are marked as installed in Tools & Settings > Updates & Upgrades .
No SMTP and IMAP/POP3 servers are installed.
Install one of the SMTP servers and one of IMAP/POP3 servers in Tools & Settings > Updates & Upgrades > Mail hosting .