Mail receives email but does not send

Hi,
I've just started to use Mail and am now using it to send and receive an email account that I used to run through Thunderbird on my Windows machine.
Mail can receive email for me, but it won't send it. When I try to send email, first I get an error message:
“... does not appear to be a valid email address. Please check the address and try again.
Then another:
This message could not be delivered and will remain in your Outbox until it can be delivered.
Verify that you have addressed this message correctly. Check your SMTP server settings in Mail Preferences and verify any advanced settings with your system administrator.
What's the problem? The settings are the ones I've been using for years. This is the only thing in OS X that hasn't worked yet!
Any help would be great.
Cheers,
Phil

Hi,
I just thought I would jump in here because last night I starting having this same problem. I have used Mail for years for my POP accounts (I have about five that I access through the program). I can receive mail; however, I cannot send it. I receive messages like:
"The server response was: relaying mail to hotmail.com is not allowed"
When I try sending the mail through my .mac server, I receive a message that tells me I am not recognized as a .mac member.
However, I can log into my ISP webmail and my .mac account just fine.
I have tried deleting the account and readding it; this hasn't made a difference to the outgoing error message. I use my ISP server to access email, etc. The Server Port Number I use is 110 for the POP accounts and 143 for the .mac, and I have selected None for authentication. There is a discrepancy in server ports. In the general account information settings, the server number is 25; in the advanced account settings, the server number is 110. Changing both numbers to 110 hasn't made a difference, and I cannot alter the port setting in the advanced settings.
Additionally, I can send email to myself or any of my accounts through my ISP--it is only messages to email addresses with different ISP's that I cannot send messages to.
Any ideas?
Thanks.
lsb

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