On Mon, Mar 01, 2021 at 01:24:01PM +0800, Thomas wrote: > Postfix can't send email to gsuite's MTA via IPV6 interface.
I'll take that as a premise (for your particular system). > But if I change this item to: > inet_protocols = ipv4 > > It works. And this as your work-around. > Can you help explain this? Your work-around tells your Postfix system to avoid IPv6, which per the stated premise makes email delivery to GSuite fail. Apparently, delivery over IPv4 works for you, and the work-around does the job. -- Viktor.