Error sending emails - any account

  • Thread starter Thread starter Dave Smithz
  • Start date Start date
D

Dave Smithz

Hi there,

A particular PC seems to of developed a problem sending emails. The problem
occurs using Outlook or Outlook Express. However using the same details in
thunderbird and things are fine. So it is definitely and Outlook (/Express)
problem.

When sending emails the server always fails immediately and gives the
following error.

"The message could not be sent because one of the recipients was rejected by
the server. Server Response: '550 Sender verify failed'. (Account:
'mail.MYHOST.co.uk', SMTP Server: 'mail.MYHOST.co.uk', Error Number 0x800"



Unfortunately I just missed out noting the last part of the error number. I
know this looks like a credentials error (e.g. username / password) but it
really is not because the problem only occurs on this particular pc.



I have moved the client onto thunderbird for the time being, but this is not
a satisfactory solution. They also want to avoid a re-installation.

Can anyone think any reason why this might be occurring. They want to avoid
a reinstallation of Windows.

Kind regards

Dave
 
Vince Averello said:
Does the SMTP server require authentication?
Click to expand...

I think so (Can't remember off hand), but like I said I set it up
identically on another PC and it works, so I know the problem is within
Outlook /Express itself.

Cheers
 
You have obviously looked at the settings for the account as far as servers
are concerned but I wonder if your SMTP server is checking the "From"
line... could that be a difference that you have not spotted yet? Maybe when
you installed Thunderbird it was set up automatically so you wouldn't notice
it being done.

This could be a filtering method to stop people using fake addresses to send
spam I think.

Charlie
 
Dave Smithz said:
When sending emails the server always fails immediately and gives the
following error.

"The message could not be sent because one of the recipients was
rejected by the server. Server Response: '550 Sender verify failed'.
(Account: 'mail.MYHOST.co.uk', SMTP Server: 'mail.MYHOST.co.uk',
Error Number 0x800"
Click to expand...

This sounds to me like the failing server is trying to perform a reverse
lookup on the IP address of the sending machine and finding that it doesn't
resolve to "mail.MYHOST.co.uk".
 
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