GMail is trying too hard

This is the first time ever that I’m seeing such a mailer daemon error:

Mail Delivery Subsystem <[email protected]> to me

This is an automatically generated Delivery Status Notification

Delivery to the following recipient failed permanently:

    fink-beginners @ lists.sourceforge.net

Technical details of permanent failure:
TEMP_FAILURE: Too many connections to lists.sourceforge.net

Anybody else is facing this problem?