I have Plesk Obsidian 18.0.39 on linux has 92.205.25.11 ip address and I manage many web applications, web sites on this server. My problem is that mails from dekont@garantibbva.com.tr to any mailboxes of mirshipping.com (for example gizem@mirshipping.com) are not received. There is no problem for other mailboxes of other domains, dns and mail settings are ok. But I couldn't understand where is the issue.