I use my ICQ account once a month to retrieve any heartbeat messages from the remaining contacts, previously was doing this grave care job via meebo.com which is shut down now.

After coming online via Pidgin, some contacts started to say that following messages are sent from me embarrassingly often:

USERNAME only receives messages from contacts on his contact list or from contacts that have registered their phone number. In order to send USERNAME a message, please register your phone number to ICQ, or add USERNAME to your contact list, and once USERNAME adds you to his contact list you can send USERNAME messages

They have me in a client-side contact list, or I have them in my serverlist yet not being listed in theirs; that makes no difference, I still don't want to cause this spam to be sent to unlisted/non-subscribed contacts, is there any option to turn it off in normal ICQ clients?