Install - Powermta 60r3

I attempted to fetch current installation/release details but couldn't reach web sources. I can still produce a high-quality, actionable report based on established PowerMTA installation best practices and typical 6.x release behavior. Proceeding without live web verification (note: if you want exact 6.0 R3 release notes or vendor-specific commands, I can fetch them if web access is available).

11. Post-Install Recommendations

Configure reverse DNS and PTR records for sending IPs.
Set up DKIM, SPF, and DMARC for sending domains.
Monitor reputational metrics and bounce handling.
Tune vMTAs, concurrency, and retry settings for your sending profile.
Implement logging rotation for /var/log/pmta.

2.1 System Specifications

OS: CentOS 7.9 (Minimal Install)
CPU: 4+ Cores (Intel Xeon)
RAM: 8 GB Minimum (16 GB Recommended)
Disk: 50 GB SSD (Separate partition for /var/spool/pmta)

12. Troubleshooting Common Issues

| Symptom | Action | |---------|--------| | Service fails to start | Check /opt/pmta/logs/error.log and /var/log/messages | | License invalid | Verify /etc/pmta/license and hostname matches | | Port 25 blocked | Check firewall-cmd --list-all and SELinux | | Injection fails | Verify source block matches connecting IP/auth | powermta 60r3 install

9. Firewall and SELinux

Open port 25:

firewalld:

sudo firewall-cmd --add-service=smtp --permanent
sudo firewall-cmd --reload

ufw:
```
sudo ufw allow 25/tcp
```

SELinux: set to permissive or create policies allowing pmta to bind ports and write logs/spool directories.

Backup, upgrade and rollback plan

Backup pmta.conf, license, keys, and log rotation rules before upgrade.
Test upgrades in staging with identical DNS/IP configuration.
Keep previous binary and config snapshot to revert quickly.
Perform rolling upgrades across cluster to minimize downtime.

2.3 License File

A valid license file (license – no extension) was obtained from SparkPost (formerly Message Systems). The file was bound to the server’s primary MAC address and hostname. Configure reverse DNS and PTR records for sending IPs