Email sent via erpnext not syncing

my erpnext15 mailbox only syncing mails sent from other clients(gmail etc) except erpnext communication mail. I tried sending mail from gmail and my erpnext is syncing it in my mailbox but when i sent mail from erpnext communication it sents successfully to the mail address but when i check it on erpnext it wont sync.

And the weird part is default mail sent by erpnext via default outgoing mail such as
notifications are well syncing.
Please help me with this.