Mails getting delayed in SAP

Dear All,

In our SAP environment I have configured SCOT.Now when I am sending the mail it is not going immediately.

Instead of this it is getting delivered after 6-10 days.

I have checked the SCOT configuration and it is fine.

When I checked tcode SOST(overview of send orders).

It is showing msg 672(status 'yellow")..wait for communication service.

Is there something I am missing at the SAP level or there is some problem from the network side..?And if it is a network issue how to prove it as our network team is saying mail is released from SAP side to SMTP server.

Your suggestions will be greatly obliged.

Regards,

PG