Hello,
normally, you can say "relayhost = domain" and postfix searches the MX record for that domain in DNS to get the list of relayhosts.

For domains where no MX record is configured into the DNS, i would need to use more than one relayhost ...

Is that possible?

The configuration seems not to allow a syntax with more than one entry:

http://www.postfix.org/postconf.5.html#relayhost
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In the case of SMTP, specify a domain name, hostname, hostname:port, [hostname]:port, [hostaddress] or [hostaddress]:port. The form [hostname] turns off MX lookups.
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Or CAN more than one entry be used?

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