SpamAssassin Rule: FROM_MISSPACED
Standard description: From: missing whitespace
Explanation
In the From: header, the whitespace separating the display name from the angle brackets containing the email address is missing. Invalid formatting of headers can prevent various validation checks from succeeding, and also indicates the software used to send mail does not conform to this standard.
For example:
From: Example Sender<sender@example.com>
(Note that many mail clients, when formatting the received mail for reading, will display the missing space.)
Further Info
The default scores for this rule can be found in the online list of tests.
Mail header encoding is defined in RFC 5322.