I've two salesforce accounts(i.e say A & B), with two different email id's. When i send Connection invite from A to B, B is receiving the Email, But when i send it from B, A is not receiving any invites. Note: B has not accepted the invite sent by  A.

All the settings remain same in both the accounts, when i checked.

I've tested the deliverability also. A is getting 52 test emails, but B is getting 51 test emails.

Please suggest me the way to proceed or please let me know in case any other specific settings need to be checked..