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Script for generating a whitelist for Postfix's Postscreen based on large senders' SPF records

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Applies changes from https://github.com/stevejenkins/postwhite/issues/56 so scrape_yahoo works again. Closes #54 Closes #56

If you know of a high-volume mailer with a valid SPF record that deserves to be included in Postwhite's whitelist, please comment on this issue. Thanks!

enhancement
help wanted

Hello, this is the new URL for yahoo: https://postmaster.yahooinc.com/mail-servers Change it on scrape_yahoo script. Andrea

is true madness to not trust, make a whitelist from it is only makes things even worse admins that have so many mail server ips have no need of help...

http://multirbl.valli.org/lookup/1.mo1.mail-out.ovh.net.html could this be used ?, see repution and spfbl.net maybe just find asn number, and use as number to accept or deny, i see many incorrect mta setups from...

Yahoo!'s list of outbound mailer IP addresses at https://help.yahoo.com/kb/SLN23997.html seems to be no longer available; the URL now redirects to https://help.yahoo.com/kb/account?redirect=true with the message "You have been redirected to this...

SimpleLogin is a open-source email forwarder https://github.com/simple-login/app

Hey, after scraping the latest yahoo hosts, I found IPv6 addresses that aren't really valid in the final file: ``` ipv6::: ipv6::: ipv6::: ipv6::: ipv6:5e6::af ipv6:5e6::bef ipv6:5e6::af ipv6:5e6::bef ipv6:5e6::af ipv6:5e6::bef...

Take a look at https://github.com/firehol/iprange.git I was able to reduce the entries in postscreen_spf_whitelist.cidr from 1,916 down to 1,255 Thanks for your project!

Hey, recently I started to get these errors: ``` Sep 25 18:51:04 ksol postfix/postscreen[83636]: warning: cidr map /usr/local/etc/postfix/postscreen_spf_whitelist.cidr, line 5: non-null host address bits in "2a01:111:f400:7c00::/48", perhaps you should use...