"You know that feeling? You're developing a new email feature, you run your test script, and boom you realize 3 seconds too late that you used the production database. Your CEO just received an email with the subject TEST - DO NOT READ - LOREM IPSUM. Or worse: you configured a cloud SMTP server for testing, forgot to disable actual sending, and now your Mailgun account is suspended for suspicious activity because you sent 847 emails to test@example.com in 5 minutes."
"Installation and usage fit in 3 lines: # Installation pip install dsmtpd # Launch (localhost:1025 by default) dsmtpd # In your code, point to localhost:1025 # That's it! Your application thinks it's sending a real email. The SMTP server responds OK, email received!. But in reality, the email is just logged in your terminal or saved in a local Maildir. Zero configuration. Zero risk. Zero latency."
"Testing email sending in development is like juggling knives: technically possible, but you'll probably end up in the emergency room. The classic options all have their downsides: Option 1: Set up a real SMTP server Heavy to install (Postfix, Sendmail) SSL/TLS certificate management Risk of getting blacklisted if misconfigured Overkill for simple debugging Option 2: Use a cloud service (Mailgun, SendGrid) Requires an account and configuration Sending quotas Risk of accidentally sending to real addresses"
Email testing during development risks accidentally sending real messages, exposing production data, blacklisting accounts, or triggering cloud-provider suspensions. Common approaches include running a full SMTP server, using cloud transactional services, or mocking SMTP calls; each approach adds configuration, cost, latency, or fails to test end-to-end behavior. dsmtpd is a minimalist local SMTP server created to capture test traffic locally and never relay messages externally. Installation and use require a single pip command and running dsmtpd on localhost:1025, after which applications receive normal SMTP OK responses while messages are logged or stored in Maildir. The approach eliminates configuration, network latency, and accidental delivery.
Read at wirtel.be
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