Show Full E-Mail in To/From Address

Prior to 8.8.7 the default was to show a short name, hiding the full E-Mail address. In 2019 phishing via spoofing necessitated the need for the full E-Mail address to be shown as well.

https://forums.zimbra.org/viewtopic.php?t=16442

This will disable the Short E-Mail on the “default” COS 

zmprov mc default zimbraPrefShortEmailAddress FALSE

Increase Attachment and Message Size Limit

https://webhostinggeeks.com/howto/how-to-adjust-the-zimbra-maximum-message-and-upload-size-via-cli/

The default is 10MB, we are going to change it to 50MB. 

zmprov ms `zmhostname` zimbraMtaMaxMessageSize 51200000
zmprov ms `zmhostname` zimbraFileUploadMaxSize 51200000
zmprov ms `zmhostname` zimbraMailContentMaxSize 51200000
postfix reload
zmcontrol restart

Check the values 

postconf | grep message_size_limit