Excessive smtp/postfix/anvil log entries from dreamhost?

when i look at my logs, starting like two days ago, i now see TONS of entries for alc-net.dreamhost.com. the log entries look something like this:
Feb 13 08:09:56 ps473446 postfix/smtpd[22727]: connect from alc-nat.dreamhost.com[66.33.206.8]
Feb 13 08:09:56 ps473446 postfix/smtpd[22727]: disconnect from alc-nat.dreamhost.com[66.33.206.8]
Feb 13 08:13:16 ps473446 postfix/anvil[22728]: statistics: max connection rate 1/60s for (smtp:66.33.206.8) at Feb 13 08:09:56
Feb 13 08:13:16 ps473446 postfix/anvil[22728]: statistics: max connection count 1 for (smtp:66.33.206.8) at Feb 13 08:09:56
Feb 13 08:13:16 ps473446 postfix/anvil[22728]: statistics: max cache size 1 at Feb 13 08:09:56
Feb 13 08:24:57 ps473446 postfix/smtpd[3920]: connect from alc-nat.dreamhost.com[66.33.206.8]
Feb 13 08:24:58 ps473446 postfix/smtpd[3920]: disconnect from alc-nat.dreamhost.com[66.33.206.8]
Feb 13 08:28:18 ps473446 postfix/anvil[3921]: statistics: max connection rate 1/60s for (smtp:66.33.206.8) at Feb 13 08:24:57
Feb 13 08:28:18 ps473446 postfix/anvil[3921]: statistics: max connection count 1 for (smtp:66.33.206.8) at Feb 13 08:24:57
Feb 13 08:28:18 ps473446 postfix/anvil[3921]: statistics: max cache size 1 at Feb 13 08:24:57
Feb 13 08:39:57 ps473446 postfix/smtpd[19996]: connect from alc-nat.dreamhost.com[66.33.206.8]
Feb 13 08:39:57 ps473446 postfix/smtpd[19996]: disconnect from alc-nat.dreamhost.com[66.33.206.8]
Feb 13 08:43:17 ps473446 postfix/anvil[20012]: statistics: max connection rate 1/60s for (smtp:66.33.206.8) at Feb 13 08:39:57
Feb 13 08:43:17 ps473446 postfix/anvil[20012]: statistics: max connection count 1 for (smtp:66.33.206.8) at Feb 13 08:39:57
Feb 13 08:43:17 ps473446 postfix/anvil[20012]: statistics: max cache size 1 at Feb 13 08:39:57
Feb 13 08:55:01 ps473446 postfix/smtpd[19205]: connect from alc-nat.dreamhost.com[66.33.206.8]
Feb 13 08:55:01 ps473446 postfix/smtpd[19205]: disconnect from alc-nat.dreamhost.com[66.33.206.8]
Feb 13 08:58:21 ps473446 postfix/anvil[19206]: statistics: max connection rate 1/60s for (smtp:66.33.206.8) at Feb 13 08:55:01
Feb 13 08:58:21 ps473446 postfix/anvil[19206]: statistics: max connection count 1 for (smtp:66.33.206.8) at Feb 13 08:55:01
Feb 13 08:58:21 ps473446 postfix/anvil[19206]: statistics: max cache size 1 at Feb 13 08:55:01

its like every couple minutes something is causing this. and the IP (as well as hostname) seem to indicate its coming from yall.

i have pop3/imap turned off for my VPS, but that shouldnt affect smtp, right? also, this only started feb 10. i noticed there were some other, ahem, changes feb 10. is this related to that, and can be safely ignored?

That’s some of our network monitoring software checking your VPS. You can safely ignore it.