Hello everybody,

I'm developing a ecommerce site on localhost, ubuntu.
On example checkout, when I expect to get some email, I get the following message:

Unable to send e-mail. Contact the site administrator if the problem persists.
Unable to send e-mail. Contact the site administrator if the problem persists.

I thought it may be due to server problems, however I installed and configured SMTP Authentication Support module, tested it and apparently email settings are fine.

Any ideas, what may cause this?

Moreover, I'd be glad if someone could explain in depth, how the checkout process works if i'll be using a bank-link. I have enabled contibuted modules Commerce E-mail and Invoice. Is it enough to complete checkout or are the more must-have modules?

This e-mail problem just stops me from playing around and learning..