Can't send Email

[NukeSter]

14.10
32bit

I can receive but i can't send. I get this error.

Message not sent. Server replied:

    Temporary authentication failure
    454 4.7.1 <*********@****.com>: Relay access denied

I get this error when sending from the email client in EHCP.

[earnolmartin]

14.10
32bit

I can receive but i can't send. I get this error.

Message not sent. Server replied:

    Temporary authentication failure
    454 4.7.1 <*********@****.com>: Relay access denied

I get this error when sending from the email client in EHCP.

You appear to be using an email relay.  It looks like your postfix relay settings (perhaps authentication settings) need to be adjusted properly according to the suggested configuration of your relay provider.  Please ask them for support.