Yes, I am using qmail-spp and a plugin to check for a valid mailbox, along with RSL's and greylisting. We also require smtp auth when sending.
Yes, lots of mail is still coming in.
It seems that I get roughly 10 connections hanging in about 15 mins. After a couple of hours, all my connections...
I've done some more poking and this is a tcpdump of one of the connections:
reading from file smtp.out2, link-type EN10MB (Ethernet)
12:47:46.245097 IP ip150-212.viatel.ee.63573 > server.domain.com.smtp: S 1192049389:1192049389(0) win 65535 <mss 1460,nop,nop,sackOK>
:.....p.................G...
Just recently qmail-smtp connections have not been exiting gracefully.
I found this out when users started complaining that they could not send out email. When I checked, there were 40 "/var/qmail/bin/qmail-smtpd /var/vpopmail/bin/vchkpw /bin/true" sitting in the process list. Most of them were...
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