Emails on my Xperia X10

[#1]

Hi everyone, I have an issue with my emails
I have no problem receiving my mails on my mobile but it tells me the server is unreachable when I try to send emails
I am using
relay.mail.net
SMTP
Port 25
Are these settings correct ?
Thanks
leighton@beaky32.plus.com

[#2]

You have to be on a plusnet IP to use Plusnets SMTP server but POP3/IMAP collection can be done on any IP. You need to use the SMTP server of your phone supplier. Check their website.