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Unable to login to email via IMAP on Plesk server: Connection to storage server failed

Courier IMAP services is inactive after a Plesk update:

# systemctl list-units --all --state=inactive | grep courier
courier-imapd.service loaded inactive dead Courier IMAP server
courier-imaps.service loaded inactive dead Courier IMAP server with SSL/TLS support
courier-pop3d.service loaded inactive dead Courier POP3 server
courier-pop3s.service loaded inactive dead Courier POP3 server with SSL/TLS support
journalctl -u courier-pop3s shows the following error:

courier-pop3d: /usr/lib64/couriertcpd: Invalid option: -noidentlookup

Product issue:

#PPPM-14541 "Fixed the issue where Courier IMAP did not start after updating to Plesk Obsidian 18.0.63."

Fixed in:
- Plesk Obsidian 18.0.63 Update 2 19 August 2024 (Linux)

Please consider updating your server:

If update is not possible for some reason you may try the following

Until the bug is fixed, use the following workaround:

Connect to the server via SSH.
Delete the "-noidentlookup" option from the option TCPDOPTS:

# sed -i 's/TCPDOPTS="-nodnslookup -noidentlookup"/TCPDOPTS="-nodnslookup"/g' /etc/courier-imap/imapd /etc/courier-imap/pop3d
Restart services:

# systemctl restart courier-imapd.service && systemctl restart courier-imaps.service && systemctl restart courier-pop3d.service && systemctl restart courier-pop3s.service

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