Hi,
I'm using postfix-3.8.5 on fedora40 (soon to be 42) and somehow
outlook/live has stopped accepting our email. I'm in an unfortunate
situation where many local user accounts are being forwarded to offsite
gmail and outlook accounts.
I've implemented ARC and DKIM/SPF/DMARC but outlook still thinks we have a
poor IP (209.216.94.60) reputation (log entry below). Every source I've
checked (Talos, spamhaus, barracuda, etc) shows the reputation looks fine.
Some time ago I implemented rate limiting for yahoo/gmail/outlook
individually to these bulk hosts, but it doesn't seem to be helping. Would
someone review my settings?
/etc/postfix/master.cf
microsoft unix - - n - - smtp
-o syslog_name=postfix-microsoft
-o smtp_connect_timeout=$microsoft_connect_timeout
-o
smtp_connection_cache_on_demand=$microsoft_connection_cache_on_demand
/etc/postfix/main.cf
microsoft_initial_destination_concurrency = 1
microsoft_destination_concurrency_limit = 4
#microsoft_destination_recipient_limit = 4
microsoft_connect_timeout=3s
microsoft_destination_rate_delay = 61s
microsoft_connection_cache_on_demand=no
/etc/postfix/transport_microsoft
/@hotmail.com$/ microsoft:
/@live.com$/ microsoft:
/@msn.com$/ microsoft:
/@passport.com$/ microsoft:
/@passport.net$/ microsoft:
/@outlook.com$/ microsoft:
Jul 18 00:00:08 cipher postfix-microsoft/smtp[1365688]: 48324518A12E: to=<
rakesh.me...@live.com>, orig_to=<u...@hotel.example.com>, relay=
live-com.olc.protection.outlook.com[52.101.9.16]:25, delay=43080,
delays=43013/67/0.53/0.03, dsn=4.7.650, status=deferred (host
live-com.olc.protection.outlook.com[52.101.9.16] said: 451 4.7.650 The mail
server [209.216.94.60] has been temporarily rate limited due to IP
reputation. For e-mail delivery information, see https://postmaster.live.com
(S775) [Name=Protocol Filter Agent][AGT=PFA][MxId=11BB88C9F089D4AC] [
BL6PEPF0001AB76.namprd02.prod.outlook.com 2025-07-18T04:00:08.864Z
08DDC464FA38E446] (in reply to MAIL FROM command))
Ideas greatly appreciated.
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