@adityagupta-9900: you have to subscribe first to the mailing list, only the members can post there to prevent spams.
There is no moderation for members, messages go through. For non-members, sometimes the messages can be let in if a devel with admin rights has the time to review the on-hold list, otherwise all are discarded, after several days, the on-hold list can be large, full of spams, being waste of time to look at each of them.