Sending email from different ISP

[#1]

I've set up my mac to send and receive email, but when I "roam" and connect via wifi hotspots I can't send any emails. Is there something I need to do? Some setting somewhere?
Thanks,
Graham

[#2]

I've just seen something in the "common issues" and it seems I need SMTP authentication which is only available to subscription accounts. What is a subscription account? One that is paid for monthly? Like mine? Is it something I just need to request?
Thanks!
Graham

[#3]

It's where you pay monthly so if you are on Plusnet ADSL you are on a subscription account.
The none subscription accounts are mainly those who are on dialup PAYG accounts.
Note that the SMTP authentication will work when you are on a Plusnet connection so you don't need to wait until you are out and about to try this out. In fact reconfiguring it while on the Plusnet connection is a good idea as you might get caught out by other ISPs that block access to external SMTP - knowing it was working would point you in the right direction.

[#4]

Thanks.
Presumably some authentication setting needs adding to my account though, so username and password can be requested (like pop3)?

[#5]

Ooh, I've just tried it and it works!
I had SSL set as well as authentication, so either some setting was changed or that's what was stopping it working.
Cheers,
Graham

[#6]

SSL would be what was stopping it working.