Mail service settings bug

[Vladimir99]

Hello Team,
There is a bug in the mail service settings, some domain extensions (ltd) are not recognized and not accepted:

1. click
2. .online
3. .space
4. .website

Of course I haven't tested them all, but some of them work.
I would also like to know if it is possible to send mail with a proxy and in this case where to enter the proxy?
If not, is it possible to send mail via SMTP with a C++ or Javascript script that I can use in zennoposter?

Thank you for your help