Date: 4 Sep 2015 03:00 pm (UTC)
simont: (Default)
From: [personal profile] simont
(This went past on my network page; apparently we both know [personal profile] kaberett. Hello.)

The phrase "dot stuffing" rang a vague bell in my head when I read this, and indeed, something relevant-looking is specified in RFC 5321 ยง4.5.2. To summarise: when mail is transferred by SMTP, sending a single "." on a line by itself is taken to terminate the message. Therefore, to make it possible to send emails one of whose actual intended lines of content consists of a "." by itself, the message is transformed during transmission to prefix an extra "." to any line starting with ".".

The idea, of course, is that the receiving SMTP agent undoes the transformation and the mail content is restored to its original state. But here, it looks very much as if some receiving SMTP agent along the chain has forgotten to undo the dot-stuffing.
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