BUG #6346: unsubscribe doesn't work

The following bug has been logged on the website:

Bug reference: 6346
Logged by: Marcel Arts
Email address: marts(at)jambo-software(dot)com
PostgreSQL version: Unsupported/Unknown
Operating system: unix
Description:

Hi,

I try to unsubscribe but your systen says my email does not exist??!!?

your email:
>>>> unsubscribe pgsql-announce
**** The unsubscribe command did not succeed.
****
**** No e-mail addresses matching
**** marts(at)jambo-software(dot)com
**** are subscribed to the pgsql-announce mailing list.
****

Valid commands processed: 1
0 succeeded, 0 stalled, and 1 failed.

Use the following command:
sessioninfo c87027392a0481ce78832f58fd11b1bc01c97e63
to see technical information about this session.

I receive mails from "pgsql-announce(at)postgresql(dot)org" and i don't want theme
anymore.

gtz,

Marcel Arts