>> Подскажите, в какую сторону копать?
> Дак вроде все ошибки указывают на проблемы с сетью.
> Пинги с трейсама копал?[awd@mail ~]# traceroute mx1.rusholod.ru
traceroute to mx1.rusholod.ru (193.56.202.5), 30 hops max, 40 byte packets
1 servergw.brn.altaiholod.ru (10.0.0.2) 0.131 ms 0.130 ms 0.135 ms
2 172.30.0.3 (172.30.0.3) 6.173 ms 3.306 ms 3.299 ms
3 ah-brn-core-gw.178.237.91.in-addr.arpa (91.237.178.1) 8.782 ms 11.309 ms 13.056 ms
4 bar253br-t1-8-780.ll-bar.zsttk.ru (82.200.80.217) 4.849 ms 4.438 ms 4.364 ms
5 brl06.transtelecom.net (188.43.4.170) 4.397 ms 4.388 ms 4.421 ms
6 mskn18-lo1-gw.transtelecom.net (217.150.55.218) 41.544 ms 41.238 ms 41.860 ms
7 rascom-gw.transtelecom.net (188.43.228.197) 40.755 ms 38.927 ms 39.111 ms
8 80-64-96-244.rascom.as20764.net (80.64.96.244) 39.170 ms 41.074 ms 41.056 ms
9 naukanet-gw.rascom.as20764.net (81.27.254.106) 40.606 ms 40.186 ms 41.313 ms
10 unit-tel.naukanet.ru (77.94.166.38) 40.488 ms 39.709 ms 41.192 ms
11 109.95.80.98 (109.95.80.98) 41.059 ms 43.816 ms 43.840 ms
12 mail.rusholod.ru (193.56.202.5) 43.731 ms 42.234 ms 42.321 ms
[awd@mail ~]# ping mx1.rusholod.ru
PING mx1.rusholod.ru (193.56.202.5) 56(84) bytes of data.
64 bytes from mail.rusholod.ru (193.56.202.5): icmp_seq=1 ttl=54 time=39.8 ms
...
64 bytes from mail.rusholod.ru (193.56.202.5): icmp_seq=100 ttl=54 time=39.8 ms
--- mx1.rusholod.ru ping statistics ---
100 packets transmitted, 100 received, 0% packet loss, time 99054ms
rtt min/avg/max/mdev = 39.361/40.121/50.682/1.273 ms
Вроде все летает