Consistent delays to email delivery for some emails

In another thread it has been noted that emails delivered from Western Digital and Lebara suffer from a delay in processing by VM. This thread is to capture these and any other cases of delays which last longer than 5 minutes.

In some cases companies will implement a short expiry time for one time codes/pins/passwords. WD implement a 5 minute timeout. 

Consistently the emails from WD are delayed by 5 minutes. Other emails to the same account do not suffer from this problem.

Email headers seem to be OK apart from UCEPROTECT3. VM have stated this should not matter.

Anyone else seeing similar issues? From which sender (IP address if known)?

@Virginmedia - please check and advise what causes an almost exactly 5 minute delay