The string in the database is a serialized array so just changing the
email address will break that so php can't decode it properly again.
To change this:
a:1:{s:5:"email";s:20:"chris@interspire.com";}
to have your email you need to change the number before the email as well:
a:1:{s:5:"email";s:16:"email@domain.com";}
'16' is the length of the email address.
The from address can't be set if:
1) php is running in safe-mode (ask your host if this is the case)
2) your host has disabled changing the from address (it will be hardcoded to a particular value in their configuration files).

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