Avast URL Phishing is blocking our corporate mail server

Avast Free Antivirus / Premium Security
1

Hello.
Today our home-workers start reporting about problem with access to our mail server.
After research i found the AVAST Personal is blocking our corporate mail server with message: URL:Phishing
Nothing more message
How can I understand the root of problem and fix it if possible?
There were no messages about blocking by other antivirus programs, only AVG Personal
I check our site on https://www.virustotal.com and found no problem

Can somebody help me to understand the root of problem?

2

I send request to https://www.avg.com/en-us/false-positive-file-form but still no answer

3

Solved.
URL was cleared its reputation in AVAST database/
Thank you for help