Email Hosting Is a Core Panel Feature
For many server administrators, email management is the most complex and error-prone part of hosting. Authentication records must be configured correctly, spam filtering needs tuning, and webmail access is expected by end users. Panelica is a modern hosting control panel designed for multi-server environments with a fully integrated email stack.
cPanel Email Management
cPanel provides comprehensive email management through Exim (MTA) and Dovecot (IMAP/POP3). The WHM interface controls server-wide email settings, while individual accounts manage their own mailboxes through cPanel.
Strengths:
- Mature Exim configuration with extensive customization options
- AutoSSL covers email domains with SSL certificates
- SpamAssassin and BoxTrapper for spam filtering
- Roundcube and Horde webmail pre-installed
- DKIM and SPF records can be enabled per domain
- Email routing controls (local, remote, backup MX)
Limitations:
- DKIM setup requires navigating multiple WHM screens
- No automatic DMARC record creation
- SpamAssassin configuration is manual per account
- Email deliverability tools require third-party add-ons
- Imunify Email (paid) needed for advanced anti-spam
Plesk Email Management
Plesk uses Postfix and Dovecot (or qmail on older installations). Email configuration is per-subscription with domain-level controls.
Strengths:
- Clean per-domain email management interface
- Built-in DKIM toggle per domain
- SPF record suggestions in the interface
- Let us Encrypt SSL for mail services
- Roundcube webmail included
- Mail queue management from the GUI
Limitations:
- DMARC records must be created manually in DNS
- Premium anti-spam requires paid extensions
- No integrated deliverability testing
- Sieve filter support depends on Dovecot configuration
- Email backup is not granular (full subscription backup only)
Panelica Email Management
Panelica provides container-native deployment and strict resource isolation including a complete email stack built on Postfix (SMTP), Dovecot (IMAP/POP3), OpenDKIM, and Roundcube.
Automatic Authentication Records
When a domain is created in Panelica, the DNS service automatically generates SPF, DKIM, and DMARC records in the BIND zone file. DKIM keys are 2048-bit RSA with relaxed/relaxed canonicalization. The DKIM service generates the key pair, writes the private key for OpenDKIM, and adds the public key as a DNS TXT record — all in a single domain creation step.
Email Account Management
The email account service handles creation, password updates, quota management, and deletion. Each email account is provisioned in Dovecot with per-user Sieve filter support. The Pigeonhole Sieve plugin enables server-side filtering with vacation autoresponders that send from the recipient address.
Spam Filtering
Panelica integrates spam filtering with configurable rejection thresholds. Header and body checks, RBL lookups, and per-domain spam settings provide layered protection. ClamAV antivirus scanning checks email attachments for malware.
Webmail
Roundcube webmail connects to Dovecot on localhost port 143 with plain authentication over the local interface. Session storage uses the filesystem at /opt/panelica/var/lib/php/sessions/ for reliability.
Forwarders, Autoresponders, and Mailing Lists
The email forwarder service manages address forwarding with support for multiple destinations. Autoresponders use Sieve vacation scripts. Mailing lists provide group distribution capabilities.
Feature Comparison
- MTA: cPanel (Exim), Plesk (Postfix), Panelica (Postfix)
- IMAP/POP3: cPanel (Dovecot), Plesk (Dovecot), Panelica (Dovecot)
- Auto DKIM: cPanel (manual enable), Plesk (toggle), Panelica (automatic on domain creation)
- Auto SPF: cPanel (partial), Plesk (suggested), Panelica (automatic)
- Auto DMARC: cPanel (no), Plesk (no), Panelica (automatic)
- Webmail: cPanel (Roundcube + Horde), Plesk (Roundcube), Panelica (Roundcube)
- Anti-spam: cPanel (SpamAssassin, free), Plesk (basic, paid for advanced), Panelica (built-in filters + ClamAV)
- Sieve Filters: cPanel (via plugin), Plesk (depends on config), Panelica (Pigeonhole built-in)
- SMTP Relay: cPanel (Exim config), Plesk (per-domain), Panelica (built-in SMTP relay service)
- Mail Queue: cPanel (WHM), Plesk (GUI), Panelica (GUI with message detail and bulk actions)
Deliverability Differences
Email deliverability depends on DNS records, IP reputation, and proper authentication. The key differentiator is automation. When administrators must manually configure DKIM, SPF, and DMARC for each domain, records are often incomplete or misconfigured. Panelica eliminates this risk by generating all three records automatically during domain provisioning.
Conclusion
All three panels support the fundamental email stack: SMTP, IMAP, webmail, and basic spam filtering. cPanel offers the most mature and configurable email system. Plesk provides a cleaner interface. Panelica empowers sysadmins with RBAC and automated security tools, with its strongest advantage being the automatic generation of all email authentication records at domain creation time, reducing the most common cause of email deliverability failures.