@Kishore_jpg There are automatic filters in the system, and sometimes systems are not 100% perfect and may accidently flag some posts as spam, although rarely. If you find that one of your posts may be accidently marked as spam, ie, others cannot see your post, but you can, then just post the link in Connect and tag any Connect or Google moderator.
Just note that non-relevant posts may be flagged by users or moderators as well, not just the system. I haven't seen your post that you said was deleted, so I can't say whether it is an acceptable post or not.
However, do also read the below on what posts are relevant to Connect.
Due to the volume of private messages Google Moderators receive, I do not read or respond to private messages. Please post publicly so others may benefit from your discussion. If you require urgent assistance, please tag a Google Moderator. Google Moderator Thank you!