[pfx] Re: Throttling outbound traffic to outlook/live

Fri, 18 Jul 2025 10:38:28 -0700


I haven’t tried it myself but it looks like that will give you a view on your IP reputation

Kind regards,
Matthew

On 18 Jul 2025, at 6:10 pm, Alex via Postfix-users <postfix-users@postfix.org> wrote:


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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