-Update 24th June-
We have had no further reports of this issue reoccurring and we believe the issue to be fully resolved.
-Update at 17:30-
We believe we have resolved the issue, but will continue to monitor this issue before providing a full clearance.
-Original Message-
N4L are aware of current issues emailing Slingshot and Callplus email addresses at the moment. We are working on a resolution and we believe we will have a solution very shortly.  We will update once we have further information.