Dr. Wietse,

Thank you very much for taking the time to reply to my email.

I enabled TLS on Postfix with a certificate from letsencrypt.com for temporary solution. This solved the problem, we're now able to received emailsĀ  from that specific client.

Your support on this matter is appreciated!


On 2/9/2018 11:45 AM, Wietse Venema wrote:
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
You need to find out why *THEIR* firewall is refusing to deliver mail.


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