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Qmail mail servers reject e-mails when Anti-Spam is enabled Technical Level
Symptoms
  • QMail mail servers rejects outgoing mails with error from the remote site telling to look at http://cr.yp.to/docs/smtplf.html
Cause

When Anti-Spam is enabled with a disclaimer (SmartDashboard: Anti-Spam Tab -> Advanced -> Disclaimer), a few mail servers (e.g. qmail server) reject emails due to their format.

The rejection is caused by the presence of certain characters used at the end of the message: an LF at the end of line without a CR before, which is against RFC2822. (Most mail servers usually ignore this.)


Solution
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