Hi @a2usmani
Do you have access to check mail quee of your email server?
Do you see such a message when you check the email quee?
This might be due to email policy of recipient’s email server. For example, although our mail server is not listed on any of spam lists, that server has blocked our ip. It is not our domain, because no other domains can’t send emails to this server either.
host bm.saglik.gov.tr[212.175.172.102] refused to talk to me: 554 5.7.1 You are not allowed to connect.
If you are using linux server, you might also look at mail log and search for such a line.
Regards,
