iMail not working over public networks?

[Skydiver32]

iMail is able to download messages just fine in my home network however, when ever I am over a public network, eg library, sb, etc, it doesn't load. I still have access to the mail within iMail but can't download or send anything?
Any ideas

 

[acxz]

I have the same issue at university and it's because POP3/IMAP is blocked on the network.

 

[belvdr]

I have the same issue at university and it's because POP3/IMAP is blocked on the network.

and SMTP for sending.