Serves the `imap` capability socket from pasted credentials (host/imapPort/encryption/ username/password) so consumers that need to READ a mailbox — the Cloudron `recvmail` path, forums that fetch replies, ticket systems — can plug `imap` without hosting a mail server. Presets: Gmail (imap.gmail.com:993 tls), Fastmail (imap.fastmail.com:993 tls), Outlook/M365 (outlook.office365.com:993 tls), any dovecot host. Pair with external-smtp for full send+receive.