I just noticed mails to the mikrotik server are getting delayed… not sure if its greylisting or just a problem on the server:
15:44:45 -0700 Client session Connected
15:44:46 -0700 Client session <<< 220 mailgw.mikrotik.com ESMTP mikrotik.com Fri, 28 Apr 2006 01:37:44 +0300
15:44:46 -0700 Client session >>> EHLO habeas.x.com
15:44:46 -0700 Client session <<< 250 HELP
15:44:46 -0700 Client session >>> MAIL From:<sam@x.com> SIZE=254133
15:44:46 -0700 Client session <<< 250 OK
15:44:46 -0700 Client session >>> RCPT To:<support@mikrotik.com>
15:44:46 -0700 Client session <<< 250 Accepted
15:44:46 -0700 Client session >>> DATA
15:44:46 -0700 Client session <<< 354 Enter message, ending with “.” on a line by itself
15:44:52 -0700 Client session <<< 421 Unexpected failure, please try later
15:44:52 -0700 Client session *** <x@changeip.com> <support@mikrotik.com> 1 254133 00:00:05 ERROR
15:44:52 -0700 Client session >>> QUIT
15:44:52 -0700 Client session <<< 221 mailgw.mikrotik.com closing connection
Sam