Cannot send email from Mail through .mac account

I have recently opened a .mac account and started using the email service. It works fine online however I am having difficulty sending messages through the Mail application in Tiger.
Whenever I attempt to send a message, a dialog box appears saying "Cannot send message using the server smtp.mac.com".
I have tried looking at the setting in preferences. I have deleted and .mac a/c setting in Mail and re-set them up, all the problem persists.
Please help!

Hello David.
Who is your ISP used for connecting to the internet and are you accessing an email account snd SMTP server in Mail provided by your ISP?
If so, can you send messages with the email account and SMTP server provided by your ISP?
Most, if not all ISPs now block the use of SMTP servers that are outside of their network (or not provided by the ISP used for connecting to the internet) on Port 25 which is the standard port used for SMTP servers. Some ISPs allow the use of an authenticated SMTP server only (such as the .Mac SMTP server) that is outside of their network on Port 25 but some block its use regardless.
These restrictions are part of an overall effort to prevent spam emanating from the ISP's domain.
Something to try.
Go to Mail > Preferences > Accounts and under the Account Information tab for your .Mac account preferences at the SMTP server selection, select the Server Settings below for the .Mac SMTP server.
Enter 587 in place of 25 in the Server Port field and when finished, select OK to save the changed setting.
Test if this resolves the problem.
If not and you are accessing an email account and SMTP server in Mail that is provided by your ISP used for connecting to the internet, select/use your ISP's SMTP server to send mail with your .Mac account which is invisible to all recipients.

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Cannot send message using the server xxxxxxxx
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