Mail rejected error 554 on incoming from one sender only

[twisted_mobius]

Our company's email is served through Gmail & I've been using this
account for years with no issues but recently certain messages from
one sender have not been reaching the in-box. Their outgoing server is
denied and they get an error message:

#< #5.0.0 smtp;554 <acco...@mydomain.com>: Relay access denied>
#SMTP#

Final-recipient: RFC822; acco...@mydomain.com
Action: failed
Status: 5.0.0
X-Supplementary-Info: < #5.0.0 smtp;554 <acco...@mydomain.com>: Relay
access denied>

Any fixes?

[Zack (Doc)]

I had this problem myself for a short time (week?) and it was from
everyone receiving in my domain. What it was in my case is that my
domain DNS and mail relay agent company was having a problem with one
of their mail servers. This caused receiving mail servers to
occasionally fail to authorize the mail coming in. At first we
thought it was only one person sending in, but it turned out it could
happen to anyone, just luck of the draw when they sent and when the
problem was occurring. Since you're using GMail hosted, you should
have your admin check with Google through their paid support number.
I'd suspect if it truly is just the one person, that Google updated
your DNS, and this person's ISP is caching information longer than
they are supposed to. Your admin should really chase it up with
Google either way.

--

Paul Tillich - "Cynically speaking, one could say that it is true to
life to be cynical about it."

[twisted_mobius]

As I understand it, this has to do with internal relaying of mail on
the sender's side which causes the gmail server to reject the
message. We still receive other email from this sender (financial
service institution) but this particular message type (transaction
confirmation) is blocked. I don't know if the change occurred on the
sender side or gmail side but we used to receive these messages until
about six weeks ago.

On Mar 24, 4:14 am, "Zack (Doc)" <z...@tnan.net> wrote:
> I had this problem myself for a short time (week?) and it was from
> everyone receiving in my domain.  What it was in my case is that my
> domain DNS and mail relay agent company was having a problem with one
> of their mail servers.  This caused receiving mail servers to
> occasionally fail to authorize the mail coming in.  At first we
> thought it was only one person sending in, but it turned out it could
> happen to anyone, just luck of the draw when they sent and when the
> problem was occurring.  Since you're using GMail hosted, you should
> have your admin check with Google through their paid support number.
> I'd suspect if it truly is just the one person, that Google updated
> your DNS, and this person's ISP is caching information longer than
> they are supposed to.  Your admin should really chase it up with
> Google either way.
>
>
>
> On Mon, Mar 23, 2009 at 20:57, twisted_mobius <p.ae...@gmail.com> wrote:
>
> > Our company's email is served through Gmail & I've been using this
> > account for years with no issues but recently certain messages from
> > one sender have not been reaching the in-box. Their outgoing server is
> > denied and they get an error message:
>

> > #< #5.0.0 smtp;554 <accou...@mydomain.com>: Relay access denied>
> > #SMTP#
>
> > Final-recipient: RFC822; accou...@mydomain.com
> > Action: failed
> > Status: 5.0.0
> > X-Supplementary-Info: < #5.0.0 smtp;554 <accou...@mydomain.com>: Relay