Since 2 days can't send emails via Apple Mail

Hi,
for 2 days now I'm unable to send emails from Apple Mail.
I have an Hotmail account (using POP3) and a WEB.DE account (using IMAP) connected with Mail. Every time I try to send an email Mail tells me the SMTP server are offline. My mobile.me account though works properly.
To exclude problems with certain ports on my WLAN router I tried to use Thunderbird on my Windows PC with these accounts. Sending emails this way wasn't a problem at all.
Also deleting all accounts and setting them up again didn't make a change...
Even changing the OS back from Lion to SL hasn't made an impact.
Any suggestions what might cause this weird problem?

Hello P:
Since each one is different, I suspect the best answer to your question lies with your ISP.
Barry

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cognitioncoach wrote:
I have had BT broadband for a year now and recently I have had issues sending mail from mac mail on my business email. It comes back with an error saying to check that email is addressed properly and check smtp settings with admin.
This problem has only just started.
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All three laptops have been working with out fault for the last four years and just before christmas they all stopped being able to send emails using hotmail. Obviously BT have changed something somewhere along the line.
The Specialist just changed our outgoing mail server to use BTs instead. (I have been using a different SMTP server anyway as a temporary fix since christmas) Whilst we are able to send emails, we are still unable to connect to hotmails SMTP server. Still had to pay the £30 though. As far as they are concerned that still counts as a fix. Another "solution" they gave me was to change the DNS address in system preferences- Not Ideal as everytime you connect your laptop to a new network you will have to reset them.An absolute joke.
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Since 2 days can't send emails via Apple Mail

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