Emails playing up some not getting through

We are experiencing some email disruption off a few people emailing us and the message is not getting through .
and it is the same when I send an email to them , and they try and reply to it .
tried emptying past emails , clearing spam and deleted mails .
to free up space to see if that was the problem , but it is still a problem for us .
so if you have not heard from me , please try another method of contact , like text message to our mobile
077534 66064
until we sort this problem out .

Email Delivery Problems