Receiving a DNS hard error when emailing certain domains

Hi.

I am running exchange 2013 on a corporate network. A few hours ago I started receiving the following error when emailing to certain domains:
5.1.2 - Bad destination host 'DNS Hard Error looking up tfl.com.f (MX):  NXDomain'


Would appreciate any assistance you can provide.

Thanks.
fijiboyAsked:
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SreRajConnect With a Mentor Commented:
Hi,

Domain tfl.com.f does not have any MX records registered. Please check on http://mxtoolbox.com/

Please verify if the domain name is correct.
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fijiboyAuthor Commented:
Thank you SreRaj.....I missed that one.
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