That sounds like a spam-control mechanism by Surgemail, to make sure the sending server accepts SMTP connections, too. But I can't find that setting, if it exists.

Frank 

-----Original Message-----
From: John Wilkes <john@wilkes.com> 
Sent: Saturday, January 12, 2019 5:03 PM
To: surgemail-list@netwinsite.com
Subject: [SurgeMail List] problem receiving email from some sites

Occasionally someone tries to send email to my system but it doesn't go
through. Eventually they get a bounce because a connection with my
server could not be established. This has mystified me, but it happens
so rarely that I've assumed it was a problem on the sending side.

But I recently received a message that made me wonder if it is something
SurgeMail is doing:

"there is something funny about the mailserver for your domain. It
connects back to me or something and gets blocked by my firewall, then
mail sits in the queue for hours until I unblock it again."

Any idea what this is about?

-- 
John Wilkes
john@wilkes.com