SMTP error 505 Client was not authenticated

myweb

Well-Known Member
Jun 18, 2002
71
0
156
Tokyo
I have a client who has an email forwarder that forwards mail to 3 different mail addresses.

However, whenever a mail is received at the forwarder address, an error message (505 Client was not authenticated) below is returned to the sender. What does this actually mean?

-----------------------------------------------
This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

[email protected]
(ultimately generated from [email protected])
SMTP error from remote mail server after RCPT TO:<[email protected]>:
host mx.remote-server.domain [xxx.xxx.xxx.xxx]: 505 Client was not authenticated

[email protected]
(ultimately generated from [email protected])
SMTP error from remote mail server after RCPT TO:<[email protected]>:
host mx.remote-server.domain [xxx.xxx.xxx.xxx]: 505 Client was not authenticated

[email protected]
(ultimately generated from [email protected])
SMTP error from remote mail server after RCPT TO:<[email protected]>:
host mx.remote-server.domain [xxx.xxx.xxx.xxx]: 505 Client was not authenticated