Invalid sender address with error code - 17099

External Since: Oct 27, 2008 Posts: 1

I got a window pop up when sending text based message out to my ISP's
SMTP server. The only message shown on the Error was "Invalid sender
address." & the Explanation was "Mail could not be sent." no further
explanation. I got such issue occasionally and don't know why it came
back to normal without setting change.

External Since: Feb 07, 2008 Posts: 114

On 10/27/08 1:23 PM ET, "ktam98@gmail.com" <ktam98 DeleteThis @gmail.com> wrote:

> I got a window pop up when sending text based message out to my ISP's
> SMTP server. The only message shown on the Error was "Invalid sender
> address." & the Explanation was "Mail could not be sent." no further
> explanation. I got such issue occasionally and don't know why it came
> back to normal without setting change.

Every time I've seen this message, Entourage has been correct: the address
(or more commonly, one of several addresses) was formed incorrectly. Check
carefully that all the addresses on the e-mail have proper syntax and valid
domains.
--
Ed Kimball