I have used contact form 7 for one of my wordpress sites. I have also integrated wp-mail-smtp for sending mail. In local site is running properly but When I configure it on server it gives error. Problem is though I get success message but it does not send mail to specified email id. and when I try to send the test message from smtp, it gives below error
The SMTP debugging output is shown below:
SMTP -> ERROR: Failed to connect to server: Connection timed out (110)
SMTP Error: Could not connect to SMTP host.
Can any one specify the problem?
The SMTP needs to be authenticated. Download and install the WP Mail SMTP plugin. Once the local server information is added in Settings >> Email, the emails should get sent out to any outside email addresses.
Link to plugin: http://wordpress.org/extend/plugins/wp-mail-smtp/
Please try with "host as localhost"
Just try hope will helps
I needed to wipe this from the "from" field to get my emails to get through:
[your-name] <[your-email]>
Just left it blank and it worked.
In addition to installing a plugin for SMTP (smtp-wp, WP Mail SMTP, etc.) Make sure that configuration in the Contact Form 7 configuration, the text area "Message Body" contains at least the code [your-message].
来源：https://stackoverflow.com/questions/16276560/contact-form-7-mail-not-sending