Slow email delivery times for Lebara

Hi,

I have an issue where i'm unable to access OTP codes from lebara. This issue is ongoing and persistent. 

The issue is on virginmedia email side, because the OTP expiry time and the time it takes for the email to appear on virginmedia side is causing the OTP delivery time to expire. 

Can virginmedia please add lebaras email as a safe sender not causing delays for emails from lebara they are taking an average of 5-10mins to arrive which by then the OTP expires and same processes is ongoing.

I have tested with Gmail and the OTP delivery time is near instant and the OTP code works.

Their email is lebaramobile@lebara.com