Deliberately avoiding fetching mails from a given server

[Merciadri Luca]

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Hello,

As stated in the title of this thread, I want to avoid deliberately
fetching mails from a given server, when starting Gnus.

Here is an example:

1) I start Gnus,
2) I am prompted for my passwords associated with all my (5) accounts,
3) I give the first password for my first account,
4) But I want not to connect to other accounts.

How can I do this, without typing either an erroneous password, or
typing RET? This solution does not suit me.

Thanks.
- -- 
Merciadri Luca
See http://www.student.montefiore.ulg.ac.be/~merciadri/
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