Hi, I have a staff memeber who is trying to send email to someone outside the organisation, and they keep getting the below notification. They are trying to send to garyoh, but from the "ultimately generate by" part I am assuming there is a redirection or forward going on?
Also when I do an DNS, and MX lookup on mxtoolbox it says there are no A or MX records?? Their website is currently working and I can ping their hostname and it resolves an address.
Could it something on our end blocking the connection?
The address to which the message has not yet been delivered is:
(ultimately generated from email@example.com)
Delay reason: SMTP error from remote mail server after RCPT TO:<firstname.lastname@example.org>:
host 192.168.101.99 [192.168.101.99]: 451 4.3.0 <email@example.com> Temporary user lookup failure