We are hosting a customer that uses a voicemail system that forwards their voicemails to them as email attachments. Their system is apparently using a From address as <firstname.lastname@example.org>, which is getting rejected by zimbra with the message:
I know the best option would be to fix the sending system, but their software seems to be very old, and they can't upgrade for various reasons.
warning: Illegal address syntax from [sending server] in MAIL command: <email@example.com>
I found this thread which seems to be someone with the same problem, but there's not a clear solution: Illegal Address Syntax
Is there a zmprov command that will turn off 'strict_rfc821_envelope'?