Relaying is when a mail server has to deliver a message somewhere other than
to a local mailbox. For example if you were on Comcast and you were using
Comcast's mail server to send to another Comcast address, that is all local
delivery.
If however you were using Comcast's server to send email to an AOL email
address, the server would have to "relay" the message to AOL's mail server
in order to be delivered.
On a mail server the administrator defines who can relay and who cannot.
Spammers scour the internet looking for "open relays", servers that allow
anyone on the internet to use them to send mail to anyone else on the
internet. In the above example, Comcast configures their server to only
allow customers on Comcast's network to relay using their server.
In your tests you were sending mail to yourself and they came through. This
didn't require a relay as the messages were being delivered locally. For
example I could put Comcast's server in my Outgoing Mail Server field and
deliver mail to my sister (who has Comcast), but I wouldn't be able to send
mail to any non-Comcast customer.
Apparently your server requires some additional configuration in order to be
able to send mail. This could be SMTP authentication needing to be enabled,
or they may require that you use POP3 to connect first (some servers--rather
than enabling SMTP authentication--allow any user who has recently
authenticated via POP3 to relay for X amount of time).
The best bet is to contact your mail provider and ask them what settings you
need to set, as you're currently getting Relaying Denied errors. If you
would like to experiment on your own first, one of the following would
probably take care of your issue:
1. Enable SMTP authentication:
- Go into your mail account settings in Outlook.
- Once you're on the screen that displays your incoming and outgoing
servers, click the More Settings button.
- Click on the Outgoing Server Tab.
- Check the "My outgoing server (SMTP) requires authentication" box.
- Leave everything else at the defaults here and click OK, then Next,
then Finish.
- Try sending your mail again.
If this does not work....
2. Enable POP access before sending:
- Follow the above steps, however on the Outgoing Server tab, change the
radio button to "Log on to incoming mail server before sending mail".
- Try sending your mail again.
If neither of the above works, you will need to contact your mail provider
and let them know you're getting "relaying denied" messages when trying to
send mail to external addresses.
Joe
Thank you both for the assistance. Once I made the authentication change I was able to send email.