Failed when check STMP use SOCKS5 proxy

[devlamine]

I have the same problem, why in the doc it is indicated "with EnableSMTPCheck() to enable such capability if port 25 is usable, or use a socks proxy to connect over SMTP" we can understand with this sentence that the arrival of socks proxy solve the problem of SMTP with port 25 while the problem persists

Originally posted by @devlamine in https://github.com/AfterShip/email-verifier/issues/51#issuecomment-1214186744