Email Issue

Hi, For emailing i am using GMail and i done the following configurations in the web.config file, email functionality worked fine upto last month and from then its suddenly stopped, following is the code error info

<add key="SmtpServer" value="smtp.gmail.com">
<add key="SmtpServerAuthenticateUser" value="XXX@gmail.com">
<add key="SmtpServerPort" value="465">
<add key="SmtpUseSSL" value="1">
<add key="SmtpServerAuthenticatePassword" value="XXXXXXX"></add></add></add></add></add>

if i use Port:465, i can see the following error [The transport failed to connect to the server] in queued email notifications section

if i use Port:587, i can see the following error [The message could not be sent to the SMTP server. The transport error code was 0x80040217. The server response was not available ] in queued email notifications section

i am checked online, also enabled Less secure apps in Gmail still my email functionality not working, please check and kindly reply on this