Plus Addressing

Plus Addressing is a feature that allows a sender to append a tag to the user id of a recipient. This lets the recipient more easily sort the incoming mail using a mail filter.

For example, user@domain.com could also be reached using the address user+tag@domain.com.

To enable Plus Addressing with Zimbra, use zmprov as follows:

zmprov mcf zimbraMtaRecipientDelimiter +

Note that the delimiter can be a character other than '+'.

To disable Plus Addressing, use zmprov as follows:

zmprov mcf -- -zimbraMtaRecipientDelimiter +

After making changes to enable or disable this feature, it may be required to restart tomcat. Postfix should pick up the changes automatically, though it may take a couple minutes to register.