How many emails are stuck in queue and in which queue (Inbound/Outbound/Delivery queue)? Could you share a screen capture of Message Audit Log for an email that might be pending in queue and screen capture of the queue.You may want to check connectivity using the telnet command as given in article for Inbound/Outbound emails that you are experiencing issues with -
SMTP Code: "421 4.4.0 [internal] failed to connect: no mail servers for this domain could be reached at this time"
Thanks & Regards,Isha
Correct we need a pic?
Not good. Call support
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Yuk. Call support please