On 12/13/16 19:29, Mik J wrote: > Peter, you use greylists but I read somewhere that gmail servers change > their IPs when they retry to send the mails. With a high outgoing volume > of mails, many IPs can be whitelisted thanks to spamlogd. But my server > is very low volume. How would you deal with that ?
That's a fairly common problem, and comes down to a particular misfeature of the SMTP RFCs: a requirement to retry, but noe requirenment to retry from the same IP address. I grumbled about that in http://bsdly.blogspot.com/2008/10/ietf-failed-to-account-for-greylisting.html. The most common workaround is to extract the IP addresses or more likely address ranges from the SPF records that the sites publish and put in a nospamd table as seen in most of the examples. My incrementally growing nospamd is available at http://www.bsdly.net/~peter/nospamd, and Aron Poffenberger's spf_fetch script that takes a file of domain names and extracts the SPF info for you: https://github.com/akpoff/spf_fetch - Peter -- Peter N. M. Hansteen, member of the first RFC 1149 implementation team http://bsdly.blogspot.com/ http://www.bsdly.net/ http://www.nuug.no/ "Remember to set the evil bit on all malicious network traffic" delilah spamd[29949]: 85.152.224.147: disconnected after 42673 seconds.
