As of 3 weeks ago emails take 8-20 hours to arrive

We use Subscribe2 HTML premium, and it’s been working great for over a year. About 2-3 weeks ago, however, emails started becoming greatly delayed, with recipients getting them 8-20 hours after the post was published and emails triggered.

Coincidental with this, we’ve seen “name lookup timed out” errors and slowness with WordPress, so I’ve done everything suggested on various forums to resolve that:

(1) Installed the Core Control plugin and disabled cURL transport;
(2) Increased the timeout as follows:

add_filter( ‘http_request_timeout’, ‘change_http_request_timeout’ );
function change_http_request_timeout() {
return 45;

(3) Checked with my domain registrar and web host regarding any possible DNS issues.

The slowness has resolved and some areas, like the dashboard, where I was seeing this timeout have resolved. However, the emails are still greatly delayed and another plugin I use (SNAP) for sending posts to Facebook and Twitter is still getting the “name lookup timed out” error. I don’t know if this is all related, but is interesting that these are both actions to push content out off of the server (via email or social media) and both are having timing/performance issues. I have updated to WP 3.7.

Any suggestions about what else we can do or check to resolve this? I’m at a complete loss at this point.

thanks,
Luann

http://wordpress.org/plugins/subscribe2/