Emails to 365 groups not being delivered

[joebryan86]

Hi,

 

I have two emails groups (1st years and 2nd years) until friday staff were able to email these groups no problem. I go to send an email to them friday and about 2 hours later I get a bounce-back:-

 

Delivery is delayed to these recipients or groups:

Remote Server returned '400 4.4.7 Message delayed'

 

And then Sunday I get the following:-

 

Delivery hasfailed to these recipients or groups:

RemoteServer returned '< #4.4.7 smtp;550 4.4.7 QUEUE.Expired; message expired>'

 

I have checked our firewall to see if they're being held and also checked our exchange queue and they're not there (staff use outlook/exchange and students use 365) which leads me to believe that they are being held by 365.

 

Can anybody help?

 

Thanks

 

 

[sukh]

Still an issue?

[joebryan86]

Hi Sukh, no sorry should have updated the thread. Spoke to our firewall people they were adamant it wasn't the firewall and said it was an issue at Microsoft, spoke to Microsoft and they proved it wasn't their fault either. Came back after the Easter break and the issue had fixed itself. I presume the firewall guys made a change without telling us