I have been in contact via e-mail with corporate support for a while now regarding an open issue.

I tried to contact them for an update and the Kaspersky mail gateway rejected multiple attempts to reach them.

This is the address I have been using it was working fine up to today.

corporate-support@us.kaspersky.com

Is something going on? The message is below...

This is the mail system at host mailgate.kaspersky-labs.com.

I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can delete your own text from the attached returned message.

The mail system

<corporate-support@kaspersky.com>: host relay1.kaspersky-labs.com[212.5.80.24]
said: 550 <corporate-support@kaspersky.com>: Recipient address rejected:
User unknown in relay recipient table (in reply to RCPT TO command)