Hotmail - Sender email address is invalid

Hi,
Ever since I got my new iPhone 3GS, I have not been able to send emails. I had an izymail subscription for hotmail on my original iPhone and it worked fine. I synced everything over to my new iPhone 3GS and also made a new email account as Hotmail is now free to set up using POP3.
I turned my izymail account off because I was having problems with it fetching old deleted emails once or twice a week. Everything was working as normal until I tried to send an email and the following message appeared: "Sender email address is invalid"
I've tried switching my izymail account back on and switching my new Hotmail POP3 account off and my emails will send ok...
So why are my emails not sending with my newly setup Hotmail POP3 account?

Sender Address invalid is the error message you get when your SMTP (outgoing email) settings are not working.
Many times this is because you are trying to use an SMTP server on a WiFi network and the ISP is blocking all SMTP connections that are not going to the ISP servers - this is to stop spammers.
Also, you will get this message when you try to use your SMTP server on 3G or Edge - the ISP sees a connection to their email server (SMTP) coming from AT&T (or your cell carrier) network not their own network and they think it is spammer so they deny the connection.
Some things to try - turn on the default SMTP server on the ipHone that corresponds to your carrier - when on 3G/Edge you can use this outgoing email server to connect without problems. Or, look to see if your ISP offers an email server on a different port (mine offers one on port 80 - all web browsers use this so other nets can't block it). Look for settings for authenticated SMTP servers - if your mail provider offers this it may be a way in also.
The search box (top right) will bring you many threads on this same subject.

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