Hi all,
My requirement is to have seperate rules for each sender domain.

domain1 can send emails to domain1 and domain2
domain2 can send emails to domain1, domain2 and abc@domain3,xyz@domain4

I checked below 3 links:
1) Restrict users to certain domain - Zimbra :: Wiki
Seems to apply recipient restrictions across all senders
2) RestrictPostfixRecipients - Zimbra :: Wiki
Intended to protect certain mailing lists within company.
3) Restrict sending to certain domains - Zimbra :: Wiki
Looks like same as 1, applies recipient restrictions for all senders.

Is there any feature in zimbra that will cater to my requirement without hosting one instance for each sender?