Customer does not receive email after registration

[joga]

Hello everybody,

When customer make an order he doesnt receive notification via email. These troubles were happened only when customers have email addresses in some slovak email providers (centrum.sk, zoznam.sk) For example gmail runs OK.
Does anybody know why was this happened? Could using of theme affect it?

Thank you for your reply in advance

[shokinro]

I don't think this issue related to theme. It could be the problem of the customer's mail server . Ask your customer check if the emails go into Junk mail or spam mail folder.