You can have a look at Mailu
Main features include:
- Standard email server , IMAP and IMAP+, SMTP and Submission
- Advanced email features , aliases, domain aliases, custom routing
- Web access , multiple Webmails and administration interface
- User features , aliases, auto-reply, auto-forward, fetched accounts
- Admin features , global admins, announcements, per-domain delegation, quotas
- Security , enforced TLS, Letsencrypt!, outgoing DKIM, anti-virus scanner
- Antispam , auto-learn, greylisting, DMARC and SPF
- Freedom , all FOSS components, no tracker included
BTW you can also summarize the long text with the help this.
[details="Summary"]
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[/details]
Edit: Welcome to Docker hub forum.