smtp – Mageplaza_smtp module can not be activated

everyone, I installed mageplaza_smtp module, tested the function, can send mail normally, but when I want to deactivate the problem encountered. As shown in the figure below, my configuration failed all the time, which made it impossible to save it. The log shows that curl returns to a web page where I need to enter a graphical validation code to continue accessing the store. mageplaza. com address. But this is php's curl request. Has anyone ever encountered this problem? How should we solve it?

active

response

HTTP / 1.1 403 Forbidden

Date Added: Thu, 25 Apr 2019 12:15:05 GMT

Content-Type: text / html; charset = UTF-8

Connection: close

CF-Chl-Bypass: 1

Set-Cookie: __cfduid = d1852120624c1f16ea5862f0b7af58fc71556194505; expires = Fri, 24-Apr-20 12:15:05 GMT; path = /; domain = .mageplaza.com; HttpOnly

Cache-Control: max-age = 2

Expires: Thu, 25 Apr 2019 12:15:07 GMT

X-Frame-Options: SAMEORIGIN

Server: cloudflare

CF-RAY: 4cd03d8e281298d1-LAX

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