Zimbra is a mail server application. It is open-source mail server having community version and network edition (license version-paid version). Zimbra can be used as the mail server for creating the domain and also fix the error postmaster emai delivery failure, user, distribution list, managing all mail server activities.
A "POP3 email delivery failure" is a common error message that occurs due to various reasons. Some significant causes of this error are mentioned below.
Carry out these steps to fix the postmaster email delivery failure:
If you have difficulties in fixing the error postmaster email delivery failure, contact our technical support team.