Michael Welch wrote:

>    The filter rule reads: ^subject:.*spam*
>    But it's catching the word "span"

Of course.

The filter matches a line
- beginning with "subject:"
- followed by zero or more characters of any kind
  ("." means "any character", "*" means "zero or more occurences")
- followed by the letters "spa"
- followed by zero or more times "m"

> Subject: RE: [RE-wrenches] Xantrex XW4548 lifespan

1. The line starts with "subject:".
2. After that, there are zero or more characters of any kind, namely
   " RE: [RE-wrenches] Xantrex XW4548 life"
3. After that, there is "spa".
4. After that, there is no "m" (zero or more occurencens).

That's a match.

-thh
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