Tipl-toshniwal/change-default-domain-zimbra
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Setting a default domain name[edit]
To set a default domain name on a one domain zimbra install, you can run the following command as the zimbra user from the zimbra server machine command line.
su - zimbra zmprov mcf zimbraDefaultDomainName mycompany.com EX: zmprov mcf zimbraDefaultDomainName tipl.com #Done for Tipl-Thoshniwal
Additional Information
If you want to change just the @server.domain.com part of the email address you want the renameDomain command.
zmprov -l renameDomain currentDomain.com newDomain.com
Afterwards correct things like the spam/ham etc if that was your only domain and the accounts got renamed:
zmprov md domain.com zimbraAttributeToChange newvalue
Another alternative is just creating domain.com (you can have unlimited domains) and move users to it (leaving the domain server.domain.com alone).
zmprov renameAccount user@server.domain.com user@domain.com