I can resolve and reach that hostname from within the
AT&T network with no trouble:
> ######## shrapnel:~/.mail/inbox 966---> host diffloth.com
> diffloth.com A 199.232.38.4
> ######## shrapnel:~/.mail/inbox 967---> ping 199.232.38.4
> PING 199.232.38.4 (199.232.38.4): 56 data bytes
> 64 bytes from 199.232.38.4: icmp_seq=0 ttl=238 time=71.8 ms
> 64 bytes from 199.232.38.4: icmp_seq=1 ttl=238 time=70.1 ms
>
> --- 199.232.38.4 ping statistics ---
> 2 packets transmitted, 2 packets received, 0% packet loss
> round-trip min/avg/max = 70.1/70.9/71.8 ms
...but it's possible that AT&T's SMTP server can't so so.
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