Tim Böttcher · @Tim_Boettcher
145 followers · 412 posts · Server ioc.exchangeOkay... #sysadmins of #mastodon, I need your input. I'm running #Postscreen on my #postfix #email #server to greylist email from so far unknown sources.
I'm receiving an account verification email from a mail server evidently belonging to mailgun.net. The issue is they never use the same IP twice. I'd have to allowlist all possible IPs somehow, but I'm somewhat at a loss how.
Hostname of the email server stays the same, but IP address constantly changes.
#sysadmins #mastodon #Postscreen #postfix #email #server
Martin Boller :donor: :tux: :freebsd: :windows: :mastodon: · @itisiboller
478 followers · 350 posts · Server infosec.exchange#Postfix #Postscreen using #Blocklists and Deep Protocol tests #SMTP #SPAM #DNSBL #GMAIL #Hotmail #Reject #Enforce
https://blog.infosecworrier.dk/2020/03/postfixpostscreen-using-blocklists-and.html
#postfix #Postscreen #blocklists #smtp #spam #dnsbl #gmail #hotmail #Reject #Enforce