PowerMTA does not just send mail; it listens to feedback. It maintains a persistent database of bounce codes and hard/soft failures. If an email address bounces with a "user unknown" code, PowerMTA automatically suppresses that address. If a domain is throttling you (e.g., "421 try again later"), PowerMTA automatically slows down.
swaks --to user@example.com \ --from sender@yourdomain.com \ --server your-pmta-server:25 \ --header "Subject: Test" \ --body "Email body here" Powermta Server
The Ultimate Guide to PowerMTA Server: Delivering Emails at Scale PowerMTA does not just send mail; it listens to feedback
curl -v --mail-from sender@yourdomain.com \ --mail-rcpt recipient@example.com \ smtp://your-pmta-server:25 \ -T email.txt PowerMTA does not just send mail