Configurable IMAP Greeting

Feature Ideas
1

Add a configurable imapGreeting field to the Imap singleton, similar to the existing smtpGreeting in MtaStageConnect.

Problem Statement
Currently, the IMAP greeting is hardcoded as:

* OK Stalwart IMAP4rev2 at your service

This lack of configurability poses a privacy and security concern, as administrators cannot customize or obfuscate the server identity in the IMAP banner.

Proposed Solution

  • Introduce a imapGreeting field in the Imap singleton.

  • Allow administrators to define a custom IMAP greeting string via configuration.

  • Default to the current hardcoded greeting if no custom value is provided (to preserve backward compatibility).

Benefits

  • Enhances privacy/security by allowing admins to mask server identity.

  • Provides consistency with SMTP, where smtpGreeting is already configurable.

  • Improves flexibility for deployments in sensitive environments.