Just attempted to resend the notification message. Same error screen appeared but the email sent and the message has been logged.

here is the screenshot for reference

I have recently experienced this issue along with another explained in the ticket link below.

Update: I sent out the February 2016 Highlights about an hour ago and received the same error again.

We can always ask Exygy to add my code, I could give my advice on how I think they could do it.

@ori: no porblem :)! Thank you for doing this.

@jrbs we currently have a system in place however nothing has been hard coded into the Wordpress platform.

Ahh I see what I did wrong. My apologies, I have generated a new SSH key and here is the public key:

@coren: No problem, Will this work (below)? This is different from the SSH key I set up in labs.