I am having SBS 2003 Prem. and when I am sending mail to a selection of certain domains then an error from the local Exchange server gives the below:
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator. <local.domain#5.5.0 smtp;550-Callout verification failed:>
The emails send to other domains work properly. So, can anyone tell me how to solve this issue? Thanks.
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