550 relay not permitted

[Doug]

I am getting a lot of email failures with Outlook 2007 on Vista. All are
error 550 relay not permitted. Some recipients are on hotmail. My account
settings are correct. Most emails go through, but quite a lot don't. Is
there a known error in 2007? Is there a fix available?

 

[Brian Tillman]

I am getting a lot of email failures with Outlook 2007 on Vista. All
are error 550 relay not permitted. Some recipients are on hotmail.
My account settings are correct. Most emails go through, but quite a
lot don't. Is there a known error in 2007? Is there a fix
available?

This is an account configuration issue and not an Outlook error. You are
not authenticating to your outgoing server.

 

[Doug]

If that is the case, why do some emails go through.

BTW our ISP does not require outgoing authentication.

 

[Brian Tillman]

If that is the case, why do some emails go through.

Because for those particular messages, you're not relaying.

BTW our ISP does not require outgoing authentication.

That's an unusual ISP, then. Many ISPs require authentication now.

 

[Doug]

I deal with about 15 different ISPs in my business, and only one requires
outgoing authentication. If authentication was the problem, NO emails would
be delivered. The error is more likely to occur if the email has more than
one addressee. If I get the error, I can resend the emaiil to one of the
addressees and it will go through. To me it looks like an Office 2007
problem.
I hope a MVP will reply.

 

[Brian Tillman]

I deal with about 15 different ISPs in my business, and only one
requires outgoing authentication. If authentication was the problem,
NO emails would be delivered.

No necessarily true. If the sender address domain and the recipient address
domain match the ISP domain, then it might.

 

[Sven Pran]

No necessarily true. If the sender address domain and the recipient
address domain match the ISP domain, then it might.

With my main ISP I get 550 if I am connected to Internett through
an IP address that does not "belong" to the ISP (Like from a hotel).
I am not required to authenticate when sending messages.

(The IP address for the recipient does not matter.)

Sven