Bastian Blank:
> On Thu, Feb 08, 2018 at 09:43:51PM -0800, motty cruz wrote:
> > I am trying to figure out why my Postfix disconnect after EHLO command. A
> > customer is trying to email me something but Postfix disconnect: ( on the
> > customer side this is the bounced message "Remote Server returned '<
> > spring1.mydomain.com #5.0.0 smtp; 554 Security violation. Email Session
> > ID:" )
>
> This is no Postfix messages. According to Google this is some MtM
> device.
You need to find out why *THEIR* firewall is refusing to deliver mail.
Wietse
