获取CentOS7下Dovecot2.2.10配置关键字、默认值及解决配置问题

Got it, let's tackle this step by step for your specific setup—since the official example config has some quirks that don't play nice with your system.

1. Pull Accurate Defaults Without Config Errors #

The official dovecot-example.conf often has outdated syntax or version-specific issues that break doveconf -n. Skip that and use Dovecot's built-in command to get 100% accurate defaults directly from the service:

• Run doveconf -a in your terminal. This outputs every single configuration key paired with its built-in default value—even settings you haven't touched in your local configs. Best of all, it won't fail if your existing config has syntax mistakes, since it pulls straight from Dovecot's internal defaults.
• If you later want to see only your modified (non-default) settings, fix any config errors first, then run doveconf -n. But for getting the complete set of base defaults, doveconf -a is your reliable tool.

2. IMAP Config Location for Your CentOS 7.3 Setup #

You're spot-on about the official example's quirk: it wraps IMAP settings in a protocol imap block, but on your system's Dovecot 2.2.10, the distro uses a modular config structure:

• IMAP's global default settings live in /etc/dovecot/conf.d/20-imap.conf—no need to nest them in a protocol imap section here; this file already applies globally to the IMAP protocol.
• Other core configs are split into dedicated files like 10-mail.conf (storage settings) and 10-auth.conf (authentication) in the same conf.d/ directory.
• If you need to override global IMAP settings for specific use cases, you can add a protocol imap {} block in any of the conf.d/ files, but the global 20-imap.conf is where you'll find all the base IMAP defaults.

3. Avoiding Issues with the Official Example Config #

The official generic example config isn't tailored to your distro's Dovecot version. Instead:

• Check your system's bundled example configs at /usr/share/doc/dovecot-2.2.10/example-config/ (adjust the version number if needed). These are built to match your installed Dovecot and won't have syntax errors.
• Export the full set of defaults to a file for easy reference: run doveconf -a > dovecot-full-defaults.conf—this gives you a clean, error-free copy of every default setting to work from.

内容的提问来源于stack exchange，提问作者aerturk