What fails when checking the relevance of your mail server?

Use the function of checking the email address. 110 gives an error when trying to open a socket, what to do?
September 18th 19 at 23:47
1 answer
September 18th 19 at 23:49
Error 110 is Connection timed out.
Apparently you are sending to a wrong way.
PS I may be not understand something, but it seems to check the email this code hellishly excessive.

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