I want to set up Ubuntu 22 with ISPConfig Website and failover Server1 (mail1.domain.co_) Server2 (mail2.domain.co_) I have a website that is reachable with mail1.domain -> Server 1 mail2.domain -> Server 2 mail.domain > loadbalancer -> Server1 or Server2 that works just fine, even with SSL Now to my problem, i want to have some mailboxes on Server 1 and others on Server 2 DNS Setup/ External DNS --------------------------- mx1 = mail1.domain mx2 = mail2.domain Mail Setup / ISPConfig ---------- mail1.domain has Mailbox test1@domain and alias1@domain and forward1@domain to external address mail2.domain has Mailbox test2@domain and alias2@domain and forward2@domain to external address if a mail is received by mx1(mail1.domain) it will be put in the mailbox if present on that server or be forwarded to mail2.domain if a mail is received by mx2(mail1.domain) it will be put in the mailbox if present on that server or be forwarded to mail1.domain but i don't get how to use Relay domains, Relay Recipients and Email Routing to do this. i get ispconfig said: 550 5.4.0 Relaying denied or similar errors. please guide me in a direction to solve this... best regards Dennis
ISPConfig documentation page https://www.ispconfig.org/documentation/ has tutorials on "ISPConfig 3 in a Multiserver- and Cluster environment".
