Hi,
My OX in UCS is doing fine. No problem but email from Microsoft domain (hotmail.com, outlook.com, micorosft.com) is not coming in time. It is taking more than a day to reach my server. Where email from other domain is coming instantly. What should I do?
Thanks in advance.
You’ll have to read the mail log: /var/log/mail.log
When you send an email from a test account at a Microsoft, it shouldn’t take long, for their mail server to contact your server. If there is no connection for a long time, the problem is on their side, and you’ll have to contact their support.
If there is a contact, but your server rejects it temporarily, then greylisting is activated (on by default). Greylisting stalls not-well-behaving mail servers. That is an important spam filter technique. Greylisting is activated if the UCR variable mail/postfix/greylisting is enabled.
To enable popular mail providers to bypass that check, see that the UCR variable mail/postfix/greylisting/client/whitelist contains /etc/postgrey/whitelist_clients.local and then add their mail servers to it. To catch all their server, use the domain. For Microsoft mail that is outlook.com.
so I should put the domain in comma seperated value in whitelist_clients.local file like
*microsoft.com, outlook.com, hotmail.com ?
One server per line.
As Microsoft uses multiple servers, the complete domain catches all. The servers have FQDNs like outlook-com.olc.protection.outlook.com, DC5PR0301MB2358.eurprd03.prod.outlook.com,CL2RAM02HT207.eop-nam02.prod.protection.outlook.com etc.
So use outlook.com on a single line and others as well. For example:
outlook.com
gmail.com
google.com
yahoo.com
univention.de
After adding the record should I restart any service?
Yes, Postgrey (https://postgrey.schweikert.ch/) must be restarted:
systemctl restart postgrey.service
Still email is delayed. Should I disable grey listing?
Are you sure greylisting is the reason? have you tried sending a mail from microsoft and observed your mail.log? How long does it take from sending the mail until the first connection from a MS mail server in mail.log?
which part should I look? Lots of log here in mail.log
Nov 26 23:54:01 ds postfix/smtpd[7765]: NOQUEUE: reject: RCPT from mail-oln040092254013.outbound.protection.outlook.com[40.92.254.13]: 450 4.2.0 nirjhar@thedailystar.net: Recipient address rejected: Greylisted, see http://postgrey.schweikert.ch/help/thedailystar.net.html; from=lutfarn@hotmail.com to=nirjhar@thedailystar.net proto=ESMTP helo=<APC01-PU1-obe.outbound.protection.outlook.com>
It is causing by greylisting. Can you please show me a way to white list the whole domain?
As I wrote above, you should whitelist the SMTP client machine (mail-oln040092254013.outbound.protection.outlook.com) in a file listed in the UCR variable mail/postfix/greylisting/client/whitelist. Because MS uses a lot of servers you should whitelist their complete domain by putting outlook.com on a single line in the file.
I have disabled the service as I am using Kaspersky email security. Now it is fantastic. But I need to know how to set UCR values for SMTP.
Please be more specific.
<<<how to do this? I have put the entries on that .local file.
Please make sure the file is listed in the UCRV:
ucr get mail/postfix/greylisting/client/whitelist
If it is, it should be in the command in the file /etc/default/postgrey and thus also when you look at the process:
$ ps xa | grep postgrey
29725 ? Ss 0:00 postgrey --pidfile=/var/run/postgrey.pid --daemonize --inet=10023
--delay=300 --max-age=35
--retry-window=48h --auto-whitelist-clients=5 --lookup-by-host --privacy
--whitelist-clients=/etc/postgrey/whitelist_clients
--whitelist-clients=/etc/postgrey/whitelist_clients.local
--whitelist-recipients=/etc/postgrey/whitelist_recipients
--whitelist-recipients=/etc/postgrey/whitelist_recipients.local
HI,
I am facing this problem again when I have setup a new server for the mail. No mail is sending and receiving. All are pausing. Please help me.
Nirjhar